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boardsurfr said..
LeeD has a valid point about body weight. If you're an efficient light wind sailor who can plane in 11-12 knots, the possible "lower wind gains" from foiling will be small (unless you're willing to use large sails and put a lot of effort in). But if you're a regular size or heavier guy at a spot with a lot of marginal days, you may find the lighter days much more enjoyable. And you may end up windsurfing less and less over time, and foiling in higher and higher winds. You've been warned :-).
Being one of those "efficient light wind sailor who can plane in 11-12 knots" (I always kept an old Formula board and 9.5 in the car), I'm now a guy who flies in 7-10 (probably takes 9-10 to get off the water) with 2 m less sail. Since I live in a wind deprived place, this is a godsend. But that's not enough for a lot of people to consider trying it.
Here's what might be: these things rip both up and down wind in ways normal boards don't. The average rec sailor thinks about a stripe across the wind and spends all day mowing that patch of lawn. Instead, as a foiler, I can think of a box as my playground. I'm not mowing a 1km stripe but heading up and down in at least a 1 km box or more. The guys here who are riding ocean swells are doing the same thing - going way upwind to ride the swells back down. It changes completely the dimensions of your playground. How much fun is something that goes upwind/downwind like a Formula or longboard yet foot steers like a 100l freeride?
And, the adrenaline rush of trying something new: just about everyone who gives it a go describes that thrill of seeing a white cap just as they did starting out. A lot of us doing it are older dogs so it's fun to relive that part of windsurfing we remember fondly.