I have a 360 and love it. The games are unbelievable, especially on my 55" HDTV
I agree that 20GB is not nearly enough, there are game demos, movies, etc. that will easily fill that space. As far as reliability, the only issue I've had is my NBA 2K7 game had a disc read error in the middle of a game yesterday and crashed the game. I don't think it's a big deal as I played for 3-4 hours tonight with no issues, just a fluky thing.