My daughter went a couple of summers ago. She loved it! We signed her up for one week, and that was too short.
The facilities were great, the food good, and the staff was fun.
I don't think she came home with any new skills--but that's not why we sent her. Her cabin had girls from Level 3 to Level 9--all around her age (13 at the time). The girls were grouped by ability for work outs.
I'd send her again in a heartbeat, but she feels the need to stick close to her own gym this summer to learn some of those tricky skills from her most trusted coaches.