Good stuff, guess I'll weigh in here. I'm an older comeback player returning to my trumpet passion for my own amusement and musical interlude from life. That said my teacher recommended I switch from my Bach 7C to a 3C at our first meeting. I really didn't notice too much difference. After months on this setup I borrowed his Bach 1B; wow! I never really bought into the MP discussions before but this MP makes a difference for me. I've heard that, typically, 1B's are considered more "orchestra", but I noticed an easier play on both my above and below staff stuff. I've since purchased my own and use it consistently over a variety of music types. Looking forward now to the infamous 3 month time to see if there's a change.