I don't have any firsthand experience, so I can't say much other than to add my own interest in this question. My recollection is that, when we bought JUNO 10 years ago, Pacific Seacraft was offering the Leisurefurl as an (expensive!) option on the 40 and that, at that time, Don Kohlmann spoke highly of the unit.
In conversations with two skippers this fall who were getting ready for the Caribbean 1500, however, both had opted for the Schaffer boom furling systems over the Leisurefurl. They said their "research" had found more happy Shaeffer owners than Leisurfurls.
Since the above is all essentially third-hand information, take it for what it's worth. I'd love to hear skippers with first-hand experience weigh in on this thread as we, too, have discussed going to an in-boom furling system someday.
PS 40 -- #46