And best of all, it's free! Although, that hasn't stopped me from buying lots of new goodies. The sales model is great because you have complete freedom to spend only for what you want and the developers benefit too from getting more exposure.
As a long-time Tribes fan, I'm quite impressed. Hi-Rez studios has added and updated enough to make the game fresh and more refined than any other Tribes game in the past. However, they've also restrained themselves from getting too adventurous and turning the series into something it's not. It's a true modern update and a must try for any FPS fan.