This is definitely in my top 3 favorite dining experiences ever. I opted for the $150 tasting menu, but they had other prix fixe options starting at $40/head. Their a la carte dishes seem to range from 20-50. In the tasting, I enjoyed almost every dish that came out. The only dish I thought was mediocre was their signature quail and foie dish which seemed dry and overcooked. For the most part, the dishes kept getting better as the tasting menu progressed.
Service was attentive but not over bearing. It was definitely at the level you expect in this class of restaurant.
The atmosphere is more casual than most fine dining restaurants in this price range which I view as a positive.
Given how bad the economy is, I was able to easily make a reservation a couple of days before. I was surprised to see the restaurant pretty full on the Sunday at 7:45 when we were done dining.
I still may have to try Joel Robuchon at some point. However, I will definitely be back to L'Atelier de Joel Robuchon on my next Vegas trip.