I have ran the rsx line since it was realeasee late 2010. For 6 years I did not have a gailure. They do need new gears every year or so as they wil loose center. I have been running the genuine Futaba 9353 and then switched to 9373 servos for about a year 1/2 I have had 1 fail but they are the fastest with the highest TQ on the market. I would say either of these 2 you can't go wrong with.