Hi,
These look a real nifty idea, no screw driver required, cool one less tool, to carry in my work van, that's full of tools.
Now are they actually any good/ any point to them? At 79Puk ( approx 150Aud if Google is right) it's alot of money when I got 3 full sets of screws for my foil from from a fixings retailer for about 15P. A decent screwdriver cost 5P,They just seem like a nice idea if, you've got nothing to spend nearly 80P on, is that just me?
( It wouldn't let me put a pound sign so put P instead)

Why bother keeping the bottom of your board fair when you have those things dragging through the water? I know that it probably doesn't make that much difference but those little things trigger my mild OCD about drag, etc.

And, yes, I'm the type of guy who got box fillers to seal up my empty track slots on the bottom of my board.