Not sure too many people will care, as Doom 3 has been out for a few years now, but I just purchased the game and am loving it! It creates tension and suspense, and I find that makes a great experience when playing a game. I had downloaded the demo a long time ago when it was released, but never bothered getting it because I had an iMac G5, and wasn't sure that the computer would be powerful enough to play the game. I just bought a new iMac, 2.93 GHz Core 2 Duo, with the nVidia 120 (I can't afford the better graphics right now). I'm super pleased with the performance of this computer. Anyway, I'm loving Doom3, even though I may be late on the bandwagon. Is the expansion worth getting?