Yoga One's studio is gorgeous. The primary room is huge so even when the class is very full, you still have space for your mat.
Be prepared to sweat. I never went to a class that didn't leave me drenched. The classes typically have you hold postures for a good bit of time and I never found the sequencing to be complex (there are other studios in town with that focus). Their classes will get you focused on your alignment and will help you detox like crazy.