I recently replaced an old Antec SX-II case with a Smilodon. I've been happy with it so far. The fold-out motherboard tray makes it easy to put together, and the construction feels sturdy. It looks interesting without being gaudy, and airflow is fantastic. My CPU temps dropped by roughly 15c compared to the old case, and I've been able to overclock higher with lower temps.
If you decide to buy one, make sure you get the newer version with the 120mm rear exhaust fan. The original version had an 80mm rear exhaust, and a 120mm would not fit without modding the case. That was the most common complaint about the case in the reviews, and Raidmax responded by changing the design.