Me and Zegz have it and its a really good play its pretty much like the l4d survival mode mixed with CSS its intresting has a weight element to i.e. carry too much slow down sorta thing. its a very intresting play
It's like you took L4D, RE2, CSS, and TF2, tossed them into a blender, and added a dollop of terrible voice acting. It's pretty fun, challenging, and at that price it's hard to beat.