Yep...certainly I can see "some" buzzing for little kids and maybe if someone is having a hard time getting their mouthpiece placed or other problems. Even flapping and buzzing lips is ok, but as a former mouthpiece buzzer myself(at least 3 years) it hampered my range and agility when it came time to play the horn. Again because of the difference in resistance/air column the mouthpiece has vs it being in the horn. Also couple THAT with an 11 year Stamp teacher who had me playing loud low notes and soft/puny high notes, totally opposite the way a horn is supposed to work. IE, take the Irons book p.10 group 11 and blast the bottom loud and decresendo towards the top. Does great for spreading your chops apart. And sure....it's totally more fun to play the trumpet than the mouthpiece, haha.