I love mine
Dene,I have a B321 with what (I believe) they call a Doyle "Light Pack". The Doyle "Stack Pack" is actually attached to the mainsail and pulls up tight against the sail when it's hoisted, but mine is more like a cradle-type system. It only serves to catch the sail when its lowered, like a lazy-jack system except it also serves as the cover.Anyway, I love it! It makes it so easy to single- or short-hand, and you still get the performance of a non-furling main. One thing you want to do, though, is to make sure to have a way to lower the system when under sail. You don't absolutely need this, but I always lower it and furl the "cover" against the boom if I'm going to be out for awhile. It also helps in that the lazy-jack lines don't interfere with sail trim or chafe against the sail.You'll also want to have the proper sail slugs/slides, and make sure to keep the track lubed up with something like MacLube. You'd be surprised how much having the proper slugs/slides makes a difference, too!I know UK Sails makes something they call a "Lazy Cradle" which is what you are looking for (check their website), and I think Sailrite.com might make a kit as well. Really you could probably get any canvas shop or sailmaker to make you one if you can find someone that has one and make up some drawings to suit your boat.Good luck!Tim