i trained at the nyc division on and off for about 3 years, in my experience it wasnt really any different from a regular mma gym, which isnt to say anything bad, just that if you're looking for that kind of training you can get it pretty much anywhere, the sbgi doesnt offer anything special or different.
I never met matt thornton but he had two seminars at the gym(which i both missed) and i heard his teaching skills are excellent, he explains things well and what he teaches will stick in your memory as opposed to some guys that'll teach you things that you'll forget within a few weeks
