I got recently the U3 (MicroATX), and it's a great case, probably the most beautiful case I ever had, and very silent too.
Some thoughts about it:
- It's beautiful and the build quality is great. The interior is shockingly simple.
- Cooling is better than it seems
. Using a TR Macho, the rear fan is so close to the heatsink that it works like a push/pull configuration (see photos on the link below). With a good heatsink, you should be able to run a whole powerful system with just one fan (CPU or rear)
. I have a i7-3770k OCed to 4.2GHz. With light use (web browsing) the CPU is just 6ºC above room temp with both the TY140 and rear (120mm) fans spinning at 600rpm. The video card has good ventilation too, because the bottom of the case is perforated and there isn't much distance between them. It works great with a passive or semipassive card, and is perfect for a silent powerful card (Asus 670, MSI 770...)
- There isn't much room for Hard Drives/SSDs: 3x2.5" or 2x3.5" or 1x3.5"+2x2.5". But that's expected given the size of the case. Now I have 1 SSD and 1 2.5" HDD drive and it's a great combination. You should be able to fit more SSDs inside if you tape them (with an adhesive thermal pad for example) to the inner sides, there is plenty of space for that.
- It has a switch to manually adjust fans to 7/9/12v, but I removed it because I prefer to use ASUS FanXpert to control both CPU and Rear fans.
- You have to be very careful with your hardware choices. Everything is very tight inside the case, and some hardware combinations may not fit. For example, if you use a TR Macho you can't use a 3.5" HD on the side HDD tray. On the plus side, you can use whatever PSU you like, it has a lot of space for it.
- It's a bit of a pain to assemble. To replace a long videocard you may need to remove the CPU heatsink first. SATA cables are hard to plug on the new sideways motherboard SATA plugs. You may need to plug them before installing the motherboard.
- It only has holes for 5 of the 8 MicroATX screws. The other 3 use plastic standoffs. You shoud tighten very well the MB main standoffs and use rubber stickers under the plastic standoffs, because otherwise the case can hum if you use a videocard that produces a lot of vibrations (you shoudn't use that kind of video card in the first place!)
Here are 3 pics of my case, so you can see the very tight fit of a TR Macho: http://imgur.com/a/sJ4BS
Also, watch this guy putting inside this small case a Socket 2011 MB/CPU + liquid cooler + GTX Titan + 2 SSDs + 2 HDDshttps://www.youtube.com/watch?v=kF4OzlPuH98
Again, a very (very!!!) tight fit, but this config gives a good idea of how much heat this case can manage.
So, for 70€ you can have one of the most beautiful cases ever, which is also very silent and has good cooling abilities.