I agree with just about everyone who beat me to the punch, the game is kinda meh gameplay-wise. However, the game is awesome from a design standpoint, and is worth playing through once, just to check it out.
As an aside, there is a guy selling this by me at the flea market, it's in the $150-$200 range. I already own the game, so I don't need it, and I think it is at least $50 more than it is worth... but if anyone else is on a "must have" hunt, let me know.