Re: E - Z Jacks
We looked into E-Z Jacks and ended up making our own lazy jacks from the many illustrations available online.
The good part about home made is that you can fuss with the lengths of each component line to get the system set up just right for your rig. The bad part about home made is that you have to fuss with the system.
We started out with two lines---one for the luff and the other for the leach---and ended up with a single line. Also we started out running the lazy-jack-hoisting lines to the cockpit, but soon abandoned that idea as too complicated.
We used stainless steel rings instead of blocks to connect the V-shaped portions to the lazy-jack halyards; not only are rings less expensive but they are easily hooked onto horn cleats on the mast near the gooseneck so the whole system is neatly tucked away when not in use. Also, when tucked away, no modification to the mainsail cover is needed.
The lazy jacks aren't deployed for each outing; only when singlehanding or shorthanding, and then only shortly before dropping the main (keeps sail abrasion to a minimum).
Joe - currently boatless