I hate to give the Mandarin Oriental 4 stars for anything but I was a bit underwhelmed. It was a very good spa. I enjoyed my facial and my husband enjoyed his massage but I wish there would've been more coed areas for us to relax and enjoy together since we were there to celebrate our anniversary. It never felt crowded even though there were several people using the facilities as well. I really enjoyed the heated loungers but I think I will need to go back and use the facilities at night to enjoy the views of the Strip when it's lit up.
The steam room was amazing. I didn't really understand the other room right next to it though and the experience showers only lasted for 5 seconds regardless of which choice was selected.