I use a M2+ with ZZ reeds. I haven't tried the plain M2. I find it has a big sound, it's bright, but not thin at the top. Also, the entire range of the horn comes out pretty effortlessly. I play it on a YTS Z, and sometimes on a Big Bell Cannonball. It hasn't failed me yet. I've played two vintage Brilharts, a Runyon Jaguar, a metal Quantum, a Bari brand .110, and a 120/0 Berg over the last 6 or 7 years. I like the M2+ best, the metal Quantum would be second. I'm curious to try a copper Sugal KWII or GonzII. Some people love 'em and some hate 'em. They are just too expensive to try out.