Yeah that does look fun and interesting. I might have to give it a try!
edit: $8.99, I just went ahead and bought it. Reviews are ultra positive and it looks great. Just played a match, and its really really really smooth, minimal sounds, but fun. Early access too, so there will be improvements. Not quite Quake, but fun.
edit again: Get it. Cheap, fast, requires super precise accuracy and you can host servers and such. Very fun!