I personally like futaba servos. Tried both Airtronics and KO servos, and futaba's are more reliable...in my opinion. The thing I didn't like about the KO servos, was the wire that begins from the servo to the lead. The wires frayed off the from the board, which made the servo glitch like crazy. I bought the 2343 FET servo, which costs anywhere from 1-110.00 For that amount, I would have thought I'd get a reliable servo.
I also like JR servos, which you would think, they'd be the same as KO servos, but I haven't had any problems with JR servos. I possibly just received a bad KO servo, but I won't be buying another one.