KFBox or Tuttle box or whatever box are cleaner and more sleek and in every way also really strong when mounted correctly, using a good female box.
But they can of course also be junk, if the box is'nt mounted right
I like a box simply because they are "clean", eventhough they are not needed for my somewhat clumsier style
Because, having a beautiful clean board, and then slamming a plate with maybe screws or bolts sticking out, and a bulky edge/plate down in the waterstream before foiling, simply seems so wrong in my eyes eventhough I know it doesnt matter that much and they can be made a bit cleaner somtimes - but it is just wrong for me mentally
I've had the KFBox in different depths, mounted on a handful of kitefoilboards, and also on my windfoil (where the loads are much stronger usually).
As said in an older post, simply loving this distribution of forces which is an engineering masterpiece IMO, utilized to the extreme here with a sleek long carbon box so even the thinnest board will get stronger and a lot stiffer:
Less can also do it, and it you got a thin board, this box can be used for boards 20 mm thick only, and you can choose yourself if you want 1 or 2 or even 3 screws, depending on your mast: https://www.ketos-foil.com/en/foil-kf-b ... iddle.html
Again, nothing is stronger than the build/inserts used.
Can not contribute to your question Horst, about whether some has used this box for "endless" jumping - but IMO it is not about the box really, but more about the build itself whether it will hold up or not