Falcon sails are the real deal. I don't own one, but I've sailed with one a few times and I have at least a half dozen friends who own multiple sails and join us on the water. No question they can sail up and down wind.
It is a newer company and as with any start ups, the owner is making sure the "I's" are dotted and "T's" are crossed. There are some testimonials on their website and tons of video on their youtube channel and website. If you are worried about durability, just watch the video's, Falcon's perform in "conditions." All carbon fiber mast and boom and I think the owner pursuing several patents on this design. Heck you can email or call and the owner will respond directly.
Deck Rigging Gear
Overstock Outlet Foods
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