It is a great movie, and I'd also recommend the "making of" that's on the DVD. If you've ever seen a bungee jumper or skydiver or any other extreme thrillseeker and thought "why would anyone want to do that?", you'll be totally flabbergasted after watching what these two guys went through to climb a mountain.
Saw it in the theatre and on DVD. blew my mind each time. totally amazing. watch it if you can, TiVo it if you can't.