Here is my experience with Horizon Hobby (JR Service).... I bought 5 used JR 2721 servos from a guy here on RCU last year. These were installed in my newly built Miled Reed Extra 260. I was told the were slightly used and in excellent condition. Cosmetically they looked new. The maiden voyage went off without a hitch and I flew the airplane about 10 times until the cold weather set in. Well after a long winter I head out to the field and set up the airplane. When I start my range check I notice the rudder servo is occilating badly. I tried the usual system checks and I conclude the servo is bad. I send it to Horizon and in a total of 8 days (all tolled) I get a brand new 2721 in the mail saying they replaced it under warranty even though it was used I now become concerned with the other 4 servos and upon manually testing them (rotating back and forth by hand I detect alot of play in all of them around center. Now I realize these servos were probably not "slightly used". I send the remaining 4 back for a checkup. Four days later I get a call from a JR tech and he says the gears are badly worn in all of them and 2 servos had bad pots. He said he replaced the gears in all of them (at no charge) and recomended replacing the 2 bad pots. I told him to replace the pots in all the servos at my expense. I believe the total bill including shipping for 1 new and 4 completly rebuilt 2721s .. $39.00.. PRICELESS!! Keep in mind these servos are $100.00[8D] apiece. I'm totally satisfied with Horizon Hobby.