If you're in Vegas. If you're serious about Jiu Jitsu. You go to Drysdale's, simple as that.
Unfortunately, I was only able to go to one class (hey, it's Vegas after all) but it was great. The guys there are really great at Jiu Jitsu and the beating they gave me was awesome. Sonny Nohara taught the class I was at and then talked with me for a while after, he was really nice and gave me some pretty good advice.
Drysdale was doing an MMA class in the other room but came over to congratulate everyone on their PanAm performances and gave good encouragement.
Plus, the place is clean! The locker room was big and it has showers for you to wash up and go enjoy the town quickly. It's awesome.