I came across the K&G mouthpieces 6 or 7 years ago and have been hooked ever since. I get to try something different every once in a while, but so far K&G wins big. I usually play on the 3D+ on euphonium and French C tuba and on the T4B-C on trombone. Too bad the master series ( marked +) for trombone is limited to size 4.5, too small for me. I love K&G mouthpieces!
2007 Besson Prestige 2052, 3D+ K&G mouthpiece; JP373 baritone, 4B modified K&G mouthpiece; Bach 42GO trombone, T4C K&G mouthpiece; 1973 Besson New Standard 3 compensated valves, 3D+ K&G modified mouthpiece; Wessex French C tuba, 3D+ K&G modified mouthpiece.