I have had quite a bit of issues with Reedys lately. I have seven of them and only 2 feel solid in performance. I have a 9.5 and 17.5 mach 1 that both feel extremely slow even when geared and timed identical to other guys running the same car. I have 2 7.0, 2 7.5 and a 17.5 mach 2. the 17.5 feels gutless and runs hot as he!!. I have a 7.5 and 7.0 that have had heat and sensor problems, i think those two were due to a faulty sensor wire, that was the only common link between the two. The 17.5 mach 1 has solder tabs that feel like they are about to fall off. I think I'm going to take a buddys advice, until one lets me down I'm going to buy the cheap trackstar motors.