Lian Li O11 Vision Compact Mid-Tower Case Review UK 2026

You know what actually tells you whether a case is worth buying? It's not the press photos. It's the gap behind the motherboard tray. It's whether the dust filters actually come out without a fight. It's the moment you're trying to route a 24-pin cable at midnight and you realise there's nowhere near enough clearance. I've built in well over a hundred cases across twelve years, and the Lian Li O11 Vision Compact Mid-Tower Case Review UK 2026 caught my attention because Lian Li's O11 line has a proper track record. But this is the compact version, which means compromises have been made somewhere. My job is to find out where.

I spent about a month with this case, running a full build through it. We're talking a mid-range gaming rig, nothing exotic, but enough to stress every routing channel, every fan mount, and every panel latch. I'll tell you exactly what the clearances are, what fits and what doesn't, and whether the build experience is actually pleasant or just looks that way in product shots.

So if you're weighing up the Lian Li O11 Vision Compact Mid-Tower Case Review UK 2026 against a few other options in the mid-range bracket, stick around. This is the stuff that matters.

Motherboard support runs up to ATX, which covers the vast majority of builds. You're not getting E-ATX here, which is fine for a compact mid-tower. The case supports up to a 360mm radiator at the front and a 240mm or 280mm at the top, depending on your component clearance. GPU length maxes out at 360mm, which is generous for a compact chassis. CPU cooler height is rated at 167mm, so most tower coolers will fit, though some of the chunkier 170mm+ units will be tight.

Weight comes in at around 6.5kg without components, which feels solid without being a nightmare to move around. The steel is 0.8mm SPCC, which is standard for this price tier. You get tempered glass on the front and the left side, giving you that dual-window look that the Vision name implies. Two pre-installed fans are included, both 120mm units at the rear and bottom, though you'll want to add more for a proper push-pull or high-airflow setup.

The width at 272mm is where you feel the compact nature most. It's narrower than a lot of mid-towers, which is great for desk space but does mean the rear cable management area is tighter than you'd get in something like a Fractal Define 7. I measured roughly 18-20mm of clearance behind the motherboard tray, which is workable but not luxurious. If you're running a lot of thick sleeved cables, you'll need to be deliberate about routing.

On a desk, the case looks proportionate and clean. The dual-glass design means both the front and the left side are on show, so placement matters. You'll want it positioned where both panels are visible, ideally on the right side of your desk if you're right-handed. The bottom has rubber feet that grip well on both wood and glass surfaces. And the overall footprint, while not tiny, is manageable for most setups. It won't feel cramped on a standard 120cm desk.

With an ATX board installed, you've got good access to the 24-pin connector area and the CPU power headers. The top cutout for the CPU power cable is positioned well, sitting about 40mm from the top edge of the tray. That's enough clearance for most cables to route cleanly without kinking. The main 24-pin cutout is on the right side of the tray and is a decent size, around 35mm wide, so even thicker cables pass through without forcing.

One thing worth mentioning: if you're building with a larger ATX board that has components near the edges, like some of the bigger ASUS ROG or MSI MEG boards, double-check your specific board dimensions against the case specs. The compact width means there's less margin for error than in a full-size mid-tower. In my testing with a standard ATX board, everything lined up perfectly and the board seated without any drama. The I/O shield area is clean, no sharp edges around the cutout, which is something I always check because I've drawn blood on cheaper cases before.

The GPU sits on a standard horizontal mount with a PCIe riser bracket. There's no vertical GPU mount option out of the box, which is a shame given how popular that look is right now. You could potentially add a third-party riser cable and bracket, but the case isn't designed for it natively, so it's a faff. If vertical mounting is important to you, that's worth knowing upfront.

Sag support is handled by a single GPU support bracket that comes included. It's a simple adjustable arm that screws into the case floor. It works fine and doesn't look terrible, but it's not as elegant as the magnetic or tool-free sag supports you get on some premium cases. My test GPU, which was a reasonably heavy triple-fan card, sat level with the bracket in place. Without it, there was a noticeable droop. So use the bracket. It's there for a reason.

AIO support is where this case actually shines. A 360mm radiator fits in the front, which is the primary cooling position for a high-end AIO. The front panel is mesh-backed tempered glass, which sounds contradictory, but Lian Li has handled this by having a mesh layer behind the glass for airflow. It's not as open as a pure mesh front, but it's better than a solid glass panel. Top mount supports up to 280mm, which covers most 240mm and 280mm AIOs without issue.

Pump head clearance with a front-mounted 360mm AIO is something I specifically tested. With the radiator mounted at the front and a standard 120mm fan stack, the pump head on my Corsair H150i Elite sat about 15mm clear of the GPU. That's tight but manageable. If you're running a particularly tall GPU with a chunky backplate, measure carefully. The rear supports a single 120mm fan or a 120mm radiator, which is useful for exhaust if you're not using the top mount for that purpose.

The 2.5-inch mounts are split between the back of the motherboard tray and dedicated brackets in the PSU chamber. The tray-mounted ones are tool-free, using a push-and-click mechanism that actually works properly. I've used tool-free SSD mounts that feel like they're going to snap every time you use them. These feel solid. The bracket-mounted ones in the PSU chamber require a couple of screws, which is fine since you're not swapping those out regularly.

M.2 support depends entirely on your motherboard, as the case itself doesn't have any dedicated M.2 trays. That's standard for this type of case and not a criticism. Most modern motherboards have two or three M.2 slots anyway, so you're unlikely to need more. One thing I did notice: the cable routing around the drive cage area is a bit tight if you're running both 3.5-inch bays full. The SATA cables have to navigate around the PSU cables, and it can get a bit messy. Not a dealbreaker, but worth planning your cable run before you start.

Behind the tray, as I mentioned earlier, you've got around 18-20mm of clearance. That's enough for most cable runs if you're using flat or braided cables. Thick individually sleeved cables will be a squeeze, and getting the side panel back on might require a bit of persuasion. There are four Velcro straps pre-installed on the back of the tray, which is a nice touch. They're in sensible positions too, not just randomly placed. I used all four and the back panel closed cleanly with a standard cable set.

The cable routing holes around the motherboard tray are all rubber-grommeted, which is good. There are six of them in total, covering the main 24-pin area, CPU power, GPU power, and front panel connectors. The grommets are a decent thickness and don't fall out when you're pushing cables through, which sounds like a low bar but you'd be surprised how many cases fail it. The PSU shroud itself has a small gap at the front for routing cables to the front panel I/O, and it's just wide enough to pass a couple of USB headers through without forcing them.

Swapping to a front-mounted 360mm AIO brought load temps down to the mid-60s, which is where you'd expect a good AIO to land. The bottom of the case has a removable dust filter covering the PSU intake, and there's a mesh section at the bottom front for additional intake. The top panel has a mesh section too, which can be used for exhaust fans or a top radiator. The overall airflow path is intake at the front and bottom, exhaust at the rear and top, which is the standard positive pressure setup and it works well here.

The included fans are 120mm units and they're... fine. They move air, they're not particularly loud at mid-speed, but they're not going to win any awards for static pressure or airflow. If you're building a serious gaming rig, budget for a set of aftermarket fans. Three or four good 120mm fans at the front in push-pull, or a quality 360mm AIO, will transform the thermal performance. The case supports it, the included fans are just a starting point. Dust filtration is handled by the front mesh, the bottom filter, and the top mesh, so you're covered on all the main intake points. The filters are all removable for cleaning, which is essential.

The USB Type-C port is a proper 3.2 Gen 2 implementation, so you're getting up to 10Gbps throughput. That requires a USB 3.2 Gen 2 header on your motherboard, which most modern ATX boards have. If your board only has a Gen 1 header, it'll still work but at reduced speed. The Type-A ports are USB 3.0, so 5Gbps, which is standard and perfectly adequate for mice, keyboards, and USB drives.

The combined audio jack works fine. I tested it with a headset and got clean audio with no interference. Some cases have terrible front audio due to poor shielding, but this one is sorted. The internal header is HD Audio compatible, so you'll need a motherboard with an HD Audio header, which again is universal on modern boards. One small gripe: the I/O cluster is positioned quite far back on the top panel, which means if your case is under a desk, reaching for the USB ports is a stretch. It's a minor thing, but worth knowing if desk placement is a consideration for you.

Panel alignment is good. The front glass sits flush with the chassis on all four sides, and the left side panel closes with a satisfying click. There's no wobble or rattle when the panels are on. I did check for sharp edges, which is something I always do after cutting myself on a budget case years ago. The interior edges are all rolled or deburred. The cable routing holes have rubber grommets as mentioned. The only slightly sharp area I found was one of the fan mounting holes on the top panel, which had a slightly rough edge. It's not going to hurt you, but it's the kind of detail that separates a premium case from a mid-range one.

The thumbscrews throughout are captive, meaning they stay attached to the panel when you unscrew them. That's a small thing that makes a big difference when you're doing your fifth component swap and you've run out of patience for hunting down dropped screws. The PSU bracket slides in from the back and locks with two thumbscrews, which is clean and easy. The overall build quality for a mid-range case is genuinely good. Lian Li's manufacturing standards are consistently above average, and the Vision Compact reflects that. It doesn't feel like a case that's been value-engineered to death.

The Fractal Pop Air is a pure airflow case with a mesh front and no glass pretensions. It runs cooler than the O11 Vision Compact in most configurations because of that open mesh front. But it doesn't look as good, and the cable management isn't as clean. The Corsair 4000D Airflow is probably the closest competitor in terms of build quality and aesthetics. It has a mesh front too, better airflow than the O11 Vision Compact, but the dual-chamber design of the Lian Li gives it an edge for cable tidiness and overall build experience. The 4000D also doesn't have the dual-glass aesthetic that makes the Vision Compact stand out.

Pricing across all three is competitive. The O11 Vision Compact sits at a similar level to the 4000D Airflow and slightly above the Pop Air. Whether the premium over the Pop Air is worth it depends entirely on whether you care about aesthetics and build experience versus raw thermal performance. For most people building a mid-range gaming PC who want it to look good and be pleasant to build in, the O11 Vision Compact makes a strong case for itself.

But the things it does well, it does properly. The dual-chamber layout keeps the main chamber clean. The dual-glass aesthetic is genuinely attractive and different from the sea of single-window cases at this price. The build experience is pleasant, with good panel alignment, no sharp edges, captive thumbscrews throughout, and sensible cable routing holes. The 360mm front radiator support and 360mm GPU clearance mean it can handle serious hardware without compromise. And Lian Li's build quality is consistently above what you'd expect at this price tier.

Who should buy this? If you want a good-looking mid-tower that's pleasant to build in, supports a 360mm AIO, and fits current-gen GPUs without drama, this is a strong choice. It's particularly well suited to someone building a showcase system where the aesthetics matter as much as the specs. The mid-range pricing makes it accessible without feeling cheap.

Who should skip it? If you're chasing the lowest possible temperatures and airflow is your only priority, a pure mesh front case will serve you better. If you need to fit a 170mm+ air cooler, check your specific cooler dimensions carefully before committing. And if you're planning a vertical GPU mount, look elsewhere unless you're happy sourcing third-party hardware for it.

Overall, I'd score the O11 Vision Compact an 8 out of 10. It's a genuinely good case that makes sensible compromises in the right places. At its current mid-range price point, it's competitive with the best in class and better than most. Lian Li knows how to build cases, and this one shows it.