The 4MD is like a very nice 3C to me with better sound, intonation, volume, response, flexibility and expression. I like this a lot on a 7 backbore but play the 5MD now for endurance reasons. I took off 1 mark for quality because you must check the top and backbore fit together well when buying Warburton parts. The MD top is also handy to play on the cornet with an 8* backbore for a big round tone.