Tried Sumit's Yoga during the temporary Bikram Tempe, AZ closure. Sumit's is a very challenging work-out. Anyone that says Yoga isn't a work-out probably has never done mid-level to advanced Vinyasa let alone Hatha Yoga.
The teachers are friendly and the studio is extremely well kept.
I did enjoy the classes, however I found it just wasn't for me. One key difference I found between Bikram and Sumit is that Bikram is more meditative. Bikram moves a bit slower with savasanas (sp?) during the floor series. There's also a lot of emphasis on breathing exercises. Sumit classes lean more on the work-out aspect, with push-ups and sit-ups and Vinyasas. These are pluses if you are looking just for a work-out. But for myself, where I enjoy mixing things up with resistance and cardio type exercises, the meditative aspects of Bikram are a big reason I go.
Don't get me wrong, Bikram is a very challenging work-out - I'm struggling through the entire class, however in Bikram I feel like I'm truly getting away from stresses in life for 90 min. Whereas Sumit's I feel there's an element of just figuring out how to keep up and what to do next - and that's a stress in itself.