Not much else to say other than AMAZING food & service. I've been to the fancier and more expensive next door neighbor, Joel Robuchon and wasn't quite sure what to expect at L'Atelier but it was almost as nice of an experience - especially service wise.
One thing that struck a chord w me was that even though they made a slight mistake with one of my dishes (left an item on that I am allergic to), they immediately corrected it and also took it off the check - which wasn't at all necessary since they replaced it right away. I also appreciated that the waiter didn't blame the kitchen or anyone else.
As for the food itself, everything was extremely flavorful and cooked to perfection. My 3 dinner partners all agreed and said it was a fabulous meal. I liked that they offered a prix-fixe and an a la carte option AND most importantly that the whole table didn't have to order the same option. This can be an issue at many restaurants and I appreciated the flexibility.
I have to say I loved this place. I think if you only have one restaurant in Vegas to hit and don't have time or $ for the full experience next door at JR, this place is an excellent choice for an amazing dinner.