I also have a REVO 3.3 w/21 OS that i race when Electric is not allowed. I am in the Sportmans class and by far the best driver but i can cartwheel, back flip, front flip, and tumble and twist with the best of them. My point is that its a REVO plastic or metal nothing twist or broke. What really attracted me to the E was the battery compartments which i wish were a little bigger. Biggest bat that i could fit are Max Amps 2s 2p 7.4 8000mil which I am sure will not last for 30min mains or longer. I still think that it still easyer to change out batteries then to restart nitros IMO.