I have a RS4 3 also, and I really like mine. And as Silent mentioned the engine is very reliable. As long as you take the time to break it in properly, it should perform well for you. I have mine for about 1 1/2 years, I lost track of how much fuel I have run through it, and it is still running great. I have added the two speed tranny, THS pipe, and put an OS carb on the engine. The carb is a definate weak point of thr RTR 3, it only has one needle so you have to compromise your setting, this was my only real complaint with the car. But one that was easily rectified with a new carb. You got a GREAT price on it! Good luck with it.