RB,

In Mast furling. Lost; sail shape. No battens. Increased size of mast
and expense tricky systems system of Sail handling.
Gained; A lot of good, easy sailing. Easy storage of the sail. Great,
easy reefing

RB, I don't feel that they are that much improvement over a fully
battened main in Lazy Jacks.

My opinion, for what ever it is worth.

Ole Thom