I know that a lot of people on here safely use the EZ Connectors on their planes, but I'm going to give the opposite advice. I do use them, but I only use them on the throttle, nose gear steering, and sometimes the rudder. But I won't use them on any critical flight controls (i.e. ailerons and elevator) because if they come loose you won't have any control of the plane. This comes from first hand experience. I had a plane that I used EZ Connectors on the aileron. When I was flying it the controls became very mushy and I had a hard time controlling it. Since I was still pretty new in the hobby I called for help and a more experienced pilot came out and got the plane down for me. On the ground I opened it up to see what my problem was. The EZ Connector for the elevators had come loose. The only reason I got the plane back was because there was a "blob" of epoxy that had fallen on the end of the control rod, and when I pulled up the servo hit that blob and there was "just enough" up elevator to get it back on the ground. If it hadn't been for that epoxy the plane would have been toast. While others may have good luck with them, I won't use them on critical surfaces.

On most planes I will used solder links on the servo end of the control rod, and then screw on clevises on the control surface end for adjustments.

That's my 2¢ worth.

Ken