I used a JDX on alto all through high school, even for concert band and orchestra. I don't remember exactly when I switched from the stock plastic one that came with my Bundy II. It was before the interwebs, my private teacher brought me one and I didn't like it. The next week he brought me another and it clicked. Mind you I had vice grip embouchure for whatever the reason, and whatever I played had a warm, centered tone. I probably could have smoothed the edge off a broadsword.