This used to be a St. Regis a few years back. Appears they haven't updated the decor and furnishings since. I think because of this it really isn't the same as a St. Regis if that kind of thing matters to you.
Excellent service, especially during breakfast. I'm a PITA and wanted to sit by the window and they were really accommodating. Good is good and get this: they've got bread pudding with vanilla sauce for breakfast.
The butler service, a holdover from the St. Regis days, is nice but not critical differentiator. Service, again in this respect, is excellent.
Rooms are good sized, well appointed. The view is not bad but if you're coming here for holiday keep in mind it's not on the Bund so you're getting a "city view".
Bathroom is good sized and well appointed. Bath towels are the standout: beach towel sized and plush.
Definitely recommended if you're traveling here on business.