I used the Corsair Air 540 in two of my builds. Best case I've ever used.
As a counterpoint, I have this case and I'm not a huge fan.
On the positive side - it's quite roomy and cable management is quite easy, it ends up looking quite clean.
What I don't like about the case:
1. The motherboard side is completely open - there is nothing to prevent dust from getting in. Also makes things noisy as there is nothing really to quiet the sound from video card / cpu fans.
2. The included fans are pretty noisy and are lighted (personal preference in that case, I don't really care for lighted fans).
3. Drive Bays (already mentioned by others) - for such a large case, you only get two 5.25" bays, four 3.5" bays and two SSD mounting spots. Also, all the 5.25" and 3.5" bays are vertical mounted, which I don't really care for (whenever I put a CD or DVD in, I seem to not quite get it in that slot just right and end up having the CD get crunched while the tray is closing)
4. Being so bulky, I have trouble fitting it into my trunk - my car has an exceptionally narrow trunk opening though.
Anyway, mostly nitpicks, but I think my next case will be a bit more conventional and hopefully quieter.