I've been playing the beta for a while now and I love it! Still feels and plays like CSS but with different textures.
The only problem I have with it is gun game instarespawn - shit gets outta hand haha That and the fact that my computer sucks so much doo doo that even with the lowest resolution and everything either turned off or to low it gets really choppy haha
But for $13 it's worth buying, you'll have a great time!!