I tend to disagree somewhat (except that I have never had any problems with EZ connectors coming loose either) about the Z-bend comments above.

If done properly and precisely, z-bends have very little, if any, "slop" in them. The great thing about them is that they are 100% reliable. they certainly have their proper place in our hobby. I use both methods about equally and try to weigh in what's appropriate for "this" particular application.

Good luck.