I do. It's not horrible like some love to say. They don't know cause they don't run one.
I even had very fast local racer run mine (T4/MM5700) for one race day (he runs LRP brushless) and I asked him what he thought of it, the feel etc... he thought it was fine... no complaints at all.
You can play with the software to soften the throttle... they have so much rip it can be harder to control. But aside from the massive power I have no issues racing them. I'm a good club level racer... not Tebo or Cav... so what do I know? That's probably what the MM critics will say. But I'm sure if Tebo ran a MM he would do jsut fine.
