Got my new 8.5 Flyer yesterday. First thing I noticed coming from a background with sails that don't last long was the build quality. Just about the whole sail is made from Xply, even the windows. It amazes me that it is so light (around 4.5kg) but built so well. Sailworks has a great rigging video and once you watch it and setup the sail it's really easy.
No luff pocket so the mast just goes up through the cams and no requirement for a down haul tool. I rigged it on a Slake 490 constant curve (Severne spec) 38cm extension. Honestly if I had a 520 I would give it a try as I personally don't like to use that much extension. Once rigged it rotated effortlessly and feels really nice in hand. New shape with the deep square foot, high aspect, looks like a great light wind free foiling sail.
I will get it out in the next week or so and give a full report. If you're interested in one give Chris a call at Windsurf Systems he will look after you. It's my first Sailworks sail and very happy with it.