The question shouldn't be "what's great about Powerhouse?", it should be "what's not great about Powerhouse?" Because the answer is nothing.
Everything about this studio is amazing - the instructors are so welcoming and have created an amazing community in PB. Never once in the 3 years I have been a student there have I had a bad class or instructor. My body has changed so much, and so has the way I view myself. And to top it off, I've made incredible friends through this studio - both with instructors and other students. I cannot recommend Powerhouse more!