I have it, but have hardly played it due to one really annoying bug in the game. It doesn't even matter if I turn off all messages to pop up that can be turned off, I still get a "million" messages popping up, slowing down the gameplay a lot and driving me insane! Maybe they've come out with a patch to fix it, I haven't checked the Paradox fora for a while now.

Also the FPS isn't that great, even Thief 3 runs way much better then CK for me.

The game could be very good if at least that one bug gets fixed. It really destroyed the gameplay for me!