I have used the 550 and it is great little servo, Also used the airtonics,futaba and hitec servos. They all work ok. I have found that the Hitec just does not center like the Airtronics,JR or Futaba.
Never had a problem with the gears being plastic on the JR, and it is in a 1/10 F1 car. Lie you brandon, I prefer JR servos, never had one let me down. Though the KO's I have are awesome too
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