PBQ
I visited Green Valley Spa in March 2006. I found the setting stunning, but then I love the topography of southern Utah. (Amangiri is on my list of places to visit sooner rather than later).
GVS seems to go through changes all the time - in focus, in food offerings, in packages. Back then it was all inclusive; now I think you can do it totally a la carte as well. The food was the most dreadful part - very short meal hours (like 12-1 for lunch) that cut into other activities. There were only one or two choices at every meal, and they were the kind that give spa cuisine a bad name. There were also some weird policies about deposits. I think the staff are pretty much local young people. I did like the spa treatments I had, but there weren't very many offerings and the spa area was quite small. I seem to also recall the the spa shares part of the property with a family hotel so there were children around. As I said, though, because things seem to change so often, my experience four years ago might not be at all reflective of what it is like today. As they say, mileage may vary!
I wouldn't go back in any case.