The spa itself is not great. The bath is in the same room with the showers and it's just not uber relaxing. However, my massage was incredible.
I got a lomi lomi, and the guy who did it was Hawaiian and did a very traditional style massage. He played some calming Hawaiian music and was kinda cheesy with his Hawaiian anklets, but it was still a rock solid massage.
Also, it's one of the (if not THE) cheapest massage on the strip. If all you want is a good massage, this is the best one I've had in Vegas thus far. You can use the money you save on the massage to pay the facilities fee at a nice spa for the baths and such.