My wife and I went to the Arnold yesterday. It was pretty fun and I highly recommend it. The people-watching is spectacular. Lots of hot booth babes, scary body builders, ladies with arms bigger than my thighs and double-Ds.
There were lots of strong people there. We watched the squat portion of the raw powerlifting competition. The biggest squat of the day was over 600lbs. Pretty sick and very impressive for a little guy like me (max squat ~250lbs
We also watched most of the men's weightlifting and some of the women's as well as part of the strongman competition.
Overall a great experience. Good lifting, good people-watching. Definitely worth $10. If you're in the area you should go.