If your beating edges with your mm your not going to be happy with an m7 yes you may like the chassis. but not the power or torque. The edges do take more in put to ride, and yes they have crank troubles. that said do not buy a new 800 polaris as they are having mayjor issues as well and polaris is not fixing them . they have a pattern of doing this. The d7s i see run realy good but still lack the torque. Heres the deal over the next year there are going to be some great deals on these newer sleds. As economy continues to shrink more people will be forced out of sledding and there are, and will be even more sleds on the market at killer prices. If your one of the one that can keep going thats will be your best chance to buy at what would seem like a fraction of the price. Actually these days it looks alot like cat is the way to go.