Not "disappointed" exactly, but we'll probably not go back. I think most of the Signature restaurants are better. The atmosphere is certainly better than downstairs, but the food didn't knock us off our feet and service was fine--but nothing special.
I will say that the manager on duty that night came around to a few tables to inquire about the meal, etc. But he didn't visit us! And we had gotten drinks, appetizers, etc AND had been in the restaurant almost as the first customers of the evening. Very irritating....
So I guess what I'm saying is that it isn't worth a special trip. For the $$, you can do better elsewhere.