Most people that buy these have sold truggies or buggies they had and keep there motors and servos and electronics and just sell them as rollers this way whatever they buy new they do not have to spend it all again to replace the stuff. For example I sold my Mantis truggy as a roller for 220.00 without anything on it and bought a ST-RR for 650 so I only have 420.00 into it and installed my motor, servos and electrics from my mantis on it and that is all I have into it. 450.00 into a ST-RR!!!! If I did that and bought a monsoon RTM I would have $0.00 into the whole truck. That is the advantage of a RTM or a roller. Price seems pretty cheap now huh?