The MGM Grand Spa is a nice facility with warm, earth-tone decor and every amenity you can think of, including cold bottled water, fruits, granola bars and teas to enjoy while relaxing in the lounge area. The women's side of the spa was a bit convoluted, but I found my way around eventually. The main problems we had were with the rude front desk women who didn't want to help us find convenient reservations together, and who kept telling my husband he was not in the The Signature hotel room he claimed to be in when he checked in for his treatment. His services card was then shoved across the counter for his signature without any explanation nor acknowledgment that his name had indeed been associated with the room number, and he was told to go to the spa area without any direction at all.
The spa operations also had a bit of a mechanized feel to it, with lots of people waiting in the lounge and being called in one-by-one as if in a hospital waiting room. Behind the first set of doors is a long hallway with lots of smallish treatment rooms on either side -- not a very soothing feeling to be one of many laboratory guinea pigs. However, once you meet your highly qualified aesthetician or therapist and you're resting under the warm massage blanket, that vague sterile feeling dissipates.
I had a short back and shoulder massage (not deep enough for my knots, but everyone is afraid of hurting me), followed by an awesome facial by another lady named Trea. If this review was only for Trea, she would get 5 stars. I loved her cheerful and gentle manner, and her incredibly light touch. Over in the men's side of the spa, my husband also relaxed under an excellent massage. Unfortunately, he continued to receive the rude treatment outside; he did not receive a sign-out card and did not get the chance to tip his masseuse.
We may try to come back for the same folks who treated us so very well, but the gatekeepers will make this a difficult task indeed. With so many hotel spas to choose from in Vegas, the MGM may need to review their policies.