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As a sailmaker I must voice my concern regarding the materials durability.
Really? Have you had much experience with 3di? The durability and shape holding are significantly better than other processes and materials. The story always goes about the first VO70 mains that went around the world could do it again. The reason that most cruiers pass on it is cost, and some don't like the stiff handling. In practice yacht racers are getting longer sail replacement intervals, as the shapes are staying stable a lot longer. If you ever get a hole in yacht 3di sails it's pretty easy to just glue patches in place as the hole doesn't travel like other cloth. There are some sailing/match race centers that have gone with 3di for club boats as even at 2x the cost they get longer usable lives out of the mains.
I have lots of unanswered questions about these sails, but the weight and durability are not what I'm worried about, should be excellent. What remains to be seen (and it might be a while as they don't seem to be churning these out especially quickly) is if the shapes are any good, as early yacht 3dis had some oddball setups that you couldn't really tune out. Also very curious to see how what I'm assuming will be longer lifespans will make up for the extra cost, and whether North is going to insist on specific masts for their different sails, as they're probably not designed to set up on other masts.
Thansk for all the info on this thread, I'm in the US and there is zero info on these. I have a lot of experience with their yacht sails and love the 3dis, but will for sure be waiting to see what others think before getting a WS sail.