The teachers at YAS are great! Charlie's 7am yoga is wonderful- He is really nice and supportive.
My only complaint is that parking can be a bit of a hassle. There were no problems when 7am yoga was the first class, but the lot has been full since they started the 6:15am spin class. I used to try to get there 5-10 minutes early, but now I tend to show up at 7am so I get a parking space, and I have to worry about joining the class late.