People always ask what Sumits is...it's a hot studio that starts with a bit of standing bikram, then four vinyasa style flows, then floor bikram - about 20 minutes of each with breaks and abs in between. Yoga is a practice, it's different every day for everybody and it's not a performance or a competition. The instructors here are good at reminding you to listen to your body and do only what it needs and wants to do.
The Groupons I've picked up for this studio make it worth it to me because I like going in and getting a good sweat on, but I don't think I would do a membership. The flow kind of bores me and doesn't feel like too much work. Honestly it feels like rich white people patting themselves on the back for doing what they deem "tough." Yes, it's hot and yes, it's work, but I'd rather be challenged to hold poses or focus on what the instructor is saying to think about where to move next instead of just doing the same thing every time.
The people are friendly and the space is nice. I hear they are moving to a two-studio space closer to Shea during Fall 2012, so maybe they will start to offer a little more variety.