I have seen two in use
first guy followed break in to the t and his motor just blew up,he was not hard on it at all, didnt every run very good. He just sent the motor back to traxxas and got it back a week later they completely rebuilt the motor and even gave him a new cooling head all of which was of no charge to him.He hasnt put the new motor in yet but it has tons of compression now.
Second guy barely broke his in not at all buy the book, it runs great, he beats the piss out of it he has broke several thing but only because he beats the hell out of it.
Later