I've been running my Stage One M2 for the best part of ten years, solo, two-up, up-hill and down dale; Wildboarclough rough or Cat and Fiddle smooth, and it has been brilliant. Not as finely honed as the Lightning or later XB models but much more flexible ... can't say I've ever been aware of it running hot, however, and have never heard the impeller fan cut in - probably because it hasn't got one. But then why let inconvenient things like facts get in the way of a good character assassination?