I love spas, I go to as many as I can to rest and relax. I've been fortunate enough to experience the spas at Mandarin Oriental, MGM, Mandalay Bay, Aria and The Venetian. The Spa at Mandalay Bay is nice, there is no question there. What turned me off is that it was PACKED. I mean busting at the seams with women. Granted, we went on a Saturday at 10 AM but we couldn't find chairs to sit on in the main room with the pools, the locker rooms were elbow to elbow and I had to wait to shower. That turned me off.
My massage was wonderful though.