Yea I have seen that myself. By my own band instructor. She tried to change me from my original 7C, down to a 5C, then only God knows what she wanted me to buy next. Well luckily I didn't because my private instructor said the only two mouthpieces that he wanted me to play on were, a 7C, 3C, and a B2. Those are the only ones I use, each has there own advantages and disadvantages but they all are good for what I use them for.