I used my Tenor M9 for a gig this Saturday. Funny thing about the Metalites is that the tip opening does not reflect the ease of play. I tried a Med Soft Fibracell that I would normally use for an open mouthpiece and it blew too easy, sounded very shrill and squeaky. I slapped on a Medium and it fattened right up. Still gave me the growl but a nice fat growl with plenty of testosterone. It was also surprisingly easy on the lip. No embouchure fatigue whatsoever. Very pleasntly surprised!