The four of us ordered the full tasting menu, with bread, wine, and cheese at the end. Service was good and friendly, about on par with what I expect at a restaurant of such caliber (and price). Creative breads were a nice touch, and many of the dishes were thoroughly enjoyable, but I honestly can't remember a single dish that really drove me crazy. This meal took place about 2 months ago.
I don't have any particular complaints, but I was overall unimpressed with the dishes in comparison to my expectations. Among all the tasting menus I have had at Michelin-starred restaurants (6 or 7), this was the least memorable.
The bottom line is that there is better value to be had in Las Vegas, but if there are some particular dishes at Guy Savoy that excite you, I would recommend it.