I have been here a couple times, I would have enjoyed my visit to the champagne bar much more if it was more secluded. I think the cocktails are really good, particularly the house creations. But I would think for a bar that is going for a more exclusive air and charges those prices, they would have chosen a place that gave patrons more privacy. Plus since it's on the casino floor it smells to cigars and smoke. Yucky. The service leaves much to be desired too. It is very slow.
I tried replicating some of the cocktails at home, like the Flower Eclipse, but it really does need that particular champagne.
All in all, if you are in the Palazzo and have 30 minutes to kill and want a champagne coktail, come here. But don't expect great ambiance or service. You are here for the drink only.