Who plays it? Great space RTS, a lot like the best 4X games without being tedious, and instead of turn based its real time, and executed perfectly. Also looks great and runs on many weaker PCs. You can get the complete Trinity pack on Steam for cheap, whole thing is about 1.2 GB. If you haven't played it and you like RTS, space games, awesome space battles, check it out, it's a lot of fun for LAN or direct IP multiplayer (yes you can play it without a legit copy... check the bay of pirates for that).
Edit: I've updated the thread title and pics for Rebellion, this game is the tits, and even better than the originals (it keeps all the great stuff they proved out and continues to improve further)