When i started this hobby in 1989, I used EZ connectors for all four servos. Never once had them come loose during flight. Not saying it won't ever happen, but they've been very reliable in my experience. I always check them before putting on the wing. I took a break from the hobby in 1999 and just got back into it this year. I'm using the ez connectors again.

The thing I like about them is it's easy to adjust the control surfaces at the servowithout having to wind/unwind the clevis at the control horn. Basically, I HATE trying to unsnap a clevis after it's on the horn. It kills my fingers and I'll do anything to avoid it. I know I'm whining. Just my $.02