The M allows me to ride the ZX10 more. That's my logic. It's all part of my plan. Next phase is to sell the 10, then buy a track bike. The 10 has a beast of an engine, and a smooth tranny, but the ergo are horrible for me and the front end shakes aren't worth the trouble. Plus, I don't need a 10 at the track. I could do more damage with something smaller.