I dined at L'Atelier this past April after dining at the actual 3 star JR next door in January. Boy, do the 2 star difference show between the 2 restaurants.
I was quite let down by L'Atelier in terms of taste and presentation. It felt like the "bar" section of JR next door. We both ordered the chef's tasting menu, which I felt like that too much fusion taste going on. One of the dishes was a Cantonese inspired shrimp ball soup that seemed completely out of place. Most of the other dishes were quite forgettable and uninspiring that I can't even recall it anymore.
For dessert, I was served one mango custard which was awesome. The second one was a heavy chocolate mint fudge which was overwhelming.
My advise is, pay up the money and enjoy the real JR next door. It is much better than L'Atelier and will take your breath away.