I heard good and bad things about the wingsails.
Personally, I like the concept and the aerodynamics advantages. But, I am concerned about the zipper, knowing by experience that they can fail.
I also heard that the sleeve, especially when wet make the sails difficult to manipulate (they "stick" to the mast).
I would like to hear from the ones who have experienced them at sea.
Anyway, I got a good quote from Tasker thailande, and almost ready to jump.