One of the best burgers I've had in Vegas, hands down.
We had a bit of a wait (~15 minutes) before being seated, but it wasn't too bad. You can hang out in the middle of the mall and people watch until your buzzer goes off. The place feels kind of cramped once you're in there. At least it did for us. We were in a table in the middle, between the bar and some booths, but who's complaining? It's Vegas, and if you don't like crowds it sucks to be you.
A quick pitcher of beer set the dinner off right and we followed it up with a couple burgers (it IS the Burger Bar) that were cooked exactly the way we ordered them. My wife likes hers medium and I'm a burnt to a crisp kind of guy, which usually means one of us gets hosed. But not this time!
The shakes were awesome, too!