I flew my GP ultimate for about 3 hours of filght time today and have had no problems. I have about 125 flights on this plane since I got it and it was flown by two other people before I got it so who knows how many flights it has on it. I have the single servo in my plane and it is fine. There is no slop or play in the linkage and the ailerons do not flutter at all! If I were building a kit of this plane I would use 2 aileron servo's. It would just be a better way to do it. If you have a computer radio it will also give you more setup options. With the one servo setup there is alot of places that bad things can happen. I personaly have not had any problems with mine but I would use the 2 servo setup if I was building one from a kit.

Rick