I really only wanted to play Cryostasis, and am very happy with it. I saw this and thought, what the hell, a couple bucks and I get another game I might play for a couple hours. But honestly I've played more necrovision than cryostasis so far.

Cryostasis has much more of a horror feel to it than most FPS's. It reminds me of Call of Cthulhu for the Xbox and Penumbra series. It seems to have a pretty decent story so far and much slower pace than necrovision.

Necrovision is much faster paced shooting, kinda like quake but more polished.

So if your thinking about getting one and not the other just do yourself a favor and get both. It's well worth a couple of bucks for another gem that most people probably have never played.

P.S. I have windows 7 64bit and both games run fine. Cryostasis may give you a bit of lag if you have an ATI card due to the physics program that defaults to on. Just turn that off and almost all of the lag goes away.