lots of people on the st-15 thread can testify to the durability. I've personally smacked mine head first directly into a curb at full throttle. (had a low RX battery and got out of range with no failsafe... ooops) It launched itself about 10 feet straight up, tumbling the entire time. It landed upside down and bounced a couple times, knocking the muffler away from the silicon coupler in the process (and killing the engine) Anyway, the ONLY thing that broke was the mount for the tension bar that connects the gearbox with the forward portion of the chassis. This is a known design weakness of the gearbox, and the fix is to just move the mount to a different spot, and it will never break again.

besides, replacement parts are very cheap compared to the trucks, and with a little bit of bodging you can use parts from alot of other trucks on it. People have already used a different trucks suspension and A-arms, along with revo dogbones.