I've been once on a gift card -thank you hubby- and spent half a day there. Massage, facial, mani, and pedi, but like, best of the best they have to offer.
SO it may have been one of the most enjoyable spa experiences of my life,where I roam in a robe and flat flip flops all day!! lol
Sadly, this was near five years ago and have not been back due to the totally high pricing.
I've never been to one of the strip hotel spas (too cheap) but this place scores my highest as far as atmosphere and ambiance. Price is what kept this at four stars.