The concept is great. Opportunity to learn a universe of jazz concepts and techniques from live jazz artists. But I have decided to quit. 1. Growing pains never-ending. In the background the website navigation changing so much it was hard to find continuity, and sometimes would be unable to find a regular offering. That has gotten better, but then another glitch. 2. Some downright bad pedagogy. Worst was the focus of one teacher on himself, watching that narcissism get in the way of his own goals. He would try to demonstrate something by playing it excessively fast and then saying "how good is that?!" as though he needed adulation more than anything else. I have returned to a great teacher I know well and given up on the fantasy that OS is a cornucopia. I loved Peter, and Bob DeBoo and all the master class teachers and the enthusiasm of the other students.