Definitely recommended. Fantastic and relaxing experience. I went twice, once with my sisters and once with my SO. Both times for the hot Rock Yin Yoga. Yin is a slow and controlled practice of gentle stretching. My companions could all handle it, even with varying degrees of flexibility. The best part being that you get to wear your own clothes, and are encouraged to take breaks outside of the heat and drink water.
We visited on a weekend both times and it was busy. Everyone is quiet and relaxed however, so it is not bothersome. There are showers and generous sized change/waiting areas. Everything is very clean.
The location is extremely inconvenient for me, which is the only drawback. If they opened a location closer to downtown or the east end I would purchase a pass for certain. Individual sessions are pricey, but they have a wide variety of packages and promotions. Follow them on twitter for specials.