lol, i used to break in all my motors with a KIT racer... too lazy now
i do know one thing tho... if you got a motor that's not running like it used to, stuff it in the KIT racer for a couple minutes, and it runs as fast as before. i think it's cuz it gets more current/voltage force-fed to it, w/o a PCB interfering. of course, if you have a dual cell car, the KIT racer's useless