One of their private classes is a great idea for a girl's night. It was fun, but definitely more difficult than I thought it would be. Many of the girls in our group ended up with some nasty bruises! Our instructor was friendly, and very encouraging. We learned a lot, and definitely got a good workout.
The only real problem I had was that they need to be more clear about what guests should wear. I couldn't find any info on the website, so we figured regular gym clothes would be fine. Some of the people in our party were wearing yoga pants, and unable to do some of the moves because they needed to be wearing shorts.