lots of people will recommend STRONGLY against those. I personally won't use ez connectors on any flight surface that I would mind having come disconnected during flight. (which means they are still ok for throttle and rudder on smaller models) ez connectors have one problem for high torque stuff though, they offset the thrust line of the servo/pushrod, which can cause twisting on the servo and just causes unneccesary stress on the parts. a clevis on the end is perfectly inline with the arm, and Z-bends are close enough to be basically inline.

even with threadlock, temperature changes can change the metal, and if you are constantly tightening them the threadlock is broken anyway.