I transferred components from my Lian Li PC-05SX to the Lian Li PC-Q38WA and I absolutely love this smaller case. While the case is small, nothing inside it feels cramped. I was initially hesitant to buy it, because I thought the original HD and PSU mounts ruined the aesthetics of the case, but once I realized they could both easily be removed, I bought it.
It was relatively easy to build in, but I was completely dissatisfied with my first attempt. Without using the provided HD and PSU mounts, there aren't any good options for cable management, so I modded a PSU mount. I used two "L" brackets, with four bolts attached to the ventilation holes on right-side panel, using o-rings (upgrade; not in pic), washers and nuts at every point of contact.
The new PSU mount allows for over 2.5 inches of space between the PSU and right side-panel. This ended up being more than enough space to hide all of the cables. Removing the back panel now requires the extra step of disconnecting the cables from the PSU first, but I don't mind it. I really like the way it turned out.
Besides the roominess in a SFF case, I like the overall look of it. I've been using black cases for a very long time (the last silver case that I had was a CM Cosmos), and I wasn't convinced silver would be a good option. I'm glad I did. I think the black and silver internal parts, combined with the silver exterior, tie the entire look together nicely.
I also like way all of the panels are easily removed, without the need for screws. There are also no rivets in this case (at least none that I could see). I especially like that there is plenty of ventilation on the top, bottom, rear, and even the right side-panel. Finally, the case is rigid, but also very light.
What I don't like is that there aren't many options for adding fans, but I'm not sure that I need them anyway. I tried to install two Noctua NF-A12x15 FLX fans (15mm thick) to the bottom panel of the case. They ended up being slightly too thick to fit under the GPU. I might go with Scythe Slip Stream SY1212SL12H, which are slimmer at 12mm, but so far heat is not an issue at GPU stock speeds and I like how quiet it currently is. There is also a mount for an 80mm fan at the rear of the case, but my AIO cooler tubes are currently in the way.
There also aren't any good options for mounting a HDD without using the provided mount. That's ok for me since I have an M.2 on the MB and an SSD which I was able to mount to inside part of the front panel (on the bottom panel in the pics; since moved).
Finally, I would have preferred a tempered glass panel over acrylic, but that likely would have increased the cost and weight of the case. At a little over $100 and 5 1/2 pounds in weight (empty), I'll take the acrylic. I can always have a replacement tempered glass window made later.
I use this machine mostly for gaming, browsing and some productivity. If you are looking for a small form factor PC, without having to cram cables or lose a side window, then this is a pretty good option.
12 APR 2018:
I tried the Scythe fans and they did nothing to further cool the GPU. They may just have been too close to the card.
I also added a few more pics of my setup.