I've not yet finished my build but I've been wrangling with this case for a couple of weeks now.
It looks fabulous. And, honestly, when I saw it on Tom's Hardware nearly a year ago, that was all I cared about. Function was definitely not a consideration in my purchase - even though the case is rather functional. It's a little too large to be considered easy to work with but it's too functional and accessible to be called cumbersome.
The upshot of a computer case is that, aside from upgrading later, most folks only build a machine once or twice and never have to really build it more than that. Once the core components are in place, you should be set for a matter of years. This case supports that approach because the normal builder won't be forced to deal with the frustrating quirks more than once.
Among the drawbacks, the case only comes with two hard drive fans. These fans are an odd, rare size 60mm x 15mm. You'll find few of these in the normal venues (Newegg, etc.). Conveniently enough, Thermaltake sells them though as of this writing they are out of stock; Thermaltake, perhaps sensing the target market for this case has priced these Chinese-made fans which are of no particular note, save their size, at $19.99 each. In my view, that's ridiculously expensive. Nonetheless, I purchased and installed them. So, if you plan on having fans in every hard drive bay and you want them to be OEM, you're looking at an additional $100. Installing these fans (a knowledgebase entry is available on Thermaltake's site) is extremely time-consuming but not all that difficult. One must be careful not to strip any of the screws as the metal is thin and soft. It's certainly doable for even a novice, just take your time and follow the instructions.
One of the reviewers here has indicated that the lights on the side of each hard drive bay will not illuminate with 2.5" drives and, while I believe that may be true, I have ascertained that the lights function on the bays with 2.5" drives. It's possible the other reviewers drives are a different shape that doesn't facilitate actuation of the internal button . I have noticed that the pressure applied by the SATA and power connectors (depending on their angle) may push the drive out enough so that the light (which is engaged by nothing more than a simple, internal button) does not illuminate. Ultimately, I will purchase the Thermaltake backplanes for each drive bay. Note that I managed to break the first unit (which has connections for the first two bays) by over-tightening the screws.
EDIT: I finally got around to buying the backplanes (three) for all six drive bays - they were not in stock on the Thermaltake site for about three months or so. The reason I over-tightened the screws on the original was because I had forgotten (when removing it) that it doesn't mount from the rear - if you try, the physical HDD interface will never touch the drive; you must put the actual backplane in the bay and run the cable through the back, installing the screws from the front of the machine. The original comes installed that way - this was just a reinstallation mistake on my part. The process of installing the backplanes can be extremely tedious on an already-built machine. Also, after installing them, it turns out the SSDs do not engage the lights, as another reviewer noted. When I purchased the case I also bought two ICY DOCK MB882SP-1S-1B 2.5" to 3.5" SSD & SATA Hard Drive Converters. Simply put, you mount the SSDs into those enclosures and the form factor becomes that of a traditional 3.5 HDD and they engage the lights. Note that if you use the backplanes, you have no problem with the cable pressure pushing the drives toward the front and turning the HDD lights (which are not activity lights, just solid lights for each mounted drive) off.
The case fans and the hard drive fans that come with the unit are acceptably quiet - even when you add the additional four hard drive fans, the noise level is acceptable. The sound of my HD5970 graphics card fans kicking on is far more noticeable than all of the case and hard drive fans combined.
The documentation for the case is slightly better than average Chinese translated to English. 90% of the direction is clear and the parts that are not clear are rather easily understood. All in all the documentation is adequate.
As you install parts onto the case, you get more and more familiar with what things to do first and last (routing cables) and things become easier. Take a step back, take your time. There is a series of Newegg Level 10 Case Build videos on You Tube that is quite helpful and I recommend watching them.
This case does what it was supposed to do - look like nothing you've ever seen before and be a sufficiently advanced modular case at the same time. It combines these effectively. It is truly something fascinating to look upon and - bonus - it's a reasonably well designed computer case.