I had a chance to take a few lessons lately. I've never been into mouthpiece buzzing. Seemed like a waste of time. Boy was I wrong. My teacher convinced me to go at it and had some actual exercises. Within 2 weeks I can tell a difference in my tone. Way more controlled and open. So I guess any doubters out there, give it a real try, short warmups playing scales and pieces of scales. Hopefully you'll benefit as much as I have.