Well I bought a (used) T-Maxx, and it already had an RB motor on it, so it didn't have the other Traxxas thing. I've only ever used a pull-start, and none of my fuel tanks have a prime button. I was just wondering if it was worth it, because I'm about to buy a Savage XL, and if it comes with the stuff, why not convert the FS to Roto too? Just thinking out loud. I will probably buy the HPI Roto-Start plate to go on the firestorm and then not worry about it.