The RTR is a good truck once you work out the kinks, but the race roller is cheaper in the long run. As stated the RTR needs new servos right away. The stockers are junk. The plastic shock caps need to be changed as well fairly soon on the RTR. Those are the weak link and will break. The motor seems to be pretty good on the RTR. The one my buddy had ran strong and he was getting 10 min run times, then it trashed the rod after 1 gallon. Not sure how long the motor would have lasted, but his air filter fell off during a race and sucked some dirt in.
RTR has a different chassis than the race roller too, race roller has the TFT chassis and is supposed to be better. I don't know how much of a difference one can tell though.