I have built systems in 5 of these, and they are great, easy to work with, I only got cut once. The only thing is (like BuckMaster said) Poor front ventilation. There is very little way for air to get past the front panel.
On one I cut up the bottom detachable thing so it would let more air though, on three others, I just took the bottom piece off and left it off. On one (my fav) I drilled a 80mm hole, and bolted a
http://2cooltek.safeshopper.com/20/55.htm?161 there with cool looking hex screws (the grill looks better on the other side)
EDIT- BTW the drive rail's rock, and so does the detachable 3 bay little drive rack thingy