Great product, fun and practical. Wife got to read her book all the way back on 3 days of excursions. No boat should be without one.
On the longer boats the sail is easy to deploy and easy to control as the boats go straight easily.
On the sit-on-top Coupe the sail is fun. But the only negative on this boat with the sail is that when you put the sail away there is no deck rigging to put the sail under. You need to use the cord that goes around the folded sail to hold it together. This is awkward as the cord is in a strange spot with the kayak attachment points. The sail sometimes comes loose because I can't get the cord centered on the folded sail as one of the attachments is in the way.
And on the 8ft boat. It is very funny to try to control the boat and the sail as with the short boat the bow won't stay straight.
I have a carabineer I attach the sail to my PFD when I need to use my paddles. I could just hold the rope in my mouth, but I know how many lakes that rope has been in. Maybe this isn't the right way, but it works wonders.
I love the sail. And I love skimming across the water when the wind is at my back. If only it would work to go upwind...