Don't know if you remember me, but I purchased several of your mouthpieces directly from you. I live in the United States and play euphonium in The Allentown Band (America's Oldest since 1828). I very recently switched from playing the SM4 to the larger SM3. I was hesitant to do so for quite some time because I thought the SM3 would be too big, but with practice and a bit of perseverance I have grown into it. My high range is much clearer and pleasant sounding, I am able to play very loud and very soft with clarity, and my overall tone has improved. I wish I had done this before now, but there seems to be a prevalent line of thinking in the U.S. (even among some professionals) that encourages the use of small mouthpieces. To be perfectly honest with you, the SM4 was smothering my sound and hindering my musical development. I believe many others are at this stage, and are afraid to take the next step (to a larger mouthpiece). That would be a subject worth mentioning sometime on your website & may result in other stories such as mine as well as an increase in the sale of your wonderful mouthpieces!