Tried this mouthpiece following advice in Bass Playets Union. Can't fault it. I've changed from a Vincent Bach 12 Megatone, and have found the pedal register much wider and more sonorous. I have a strong embouchure, so haven't had any problems with the upper register up to top C on BBb bass, so to those who have I'd just advise you to persevere. There are no drawbacks to this mouthpiece mouthpiece, and I prefer it to all the Bach's, Mike Finn's, Wick and Loud mouthpieces I already have. Thomann's price eas the best, and I ordered on Saturday night and received it on Monday morning. Try beating service like that!