Thiis is my first ever posting and I came to this thread because of my interest in servo reliability. I have used most of the popular makes of servo and last January I fitted 2 Hitech hs5645mg 10.8 kg. digital servos to the tailerons of my Fiber Classics SU 27 Flanker. After about 20 flights I noticed that one of the control surfaces was moving slower than the other. This dissapeared for a short while but then settled into slow servo movement. Thinking that there maybe something binding I diconnected the control surface and discovered that it was the servo. I sent this back to the UK agent who returned it after repair. After several e-mail queries to the agent I was told that the motor had been replaced. I would have preferred a replacement but this was not forthcoming. This was replaced in the model and several more flights were undertaken. I noticed last week that during a preflight check that the other servo was slow. I have packed them off to the UK agents, Amerang. I have requested that they be replaced with new ones but have not had a response yet. Mindfull that with a taileron controlled model, the two servos are all you have. To have suspect servos on these surfaces is very disconcerting. I have no real gripe with Hitech since I have bought many of their servos but this is worrying. Hitech give their torque out at both 4.8 and 6 volts but on these servos there is only a 4.8 value which is 10.8 kg. Has anybody any comment