all of the servo's are good, the futaba and airtronics are the best from what i have heard (i have only run airtronics) i have heard the JR's can last 2 years or two weeks. the KO is just way to fast, and the hitec's are hitecs, lol the airtronics # is like 915145 or something with 9, 1 ,4 and 5's.