I have the floats and so far, am not impressed. The right one is sorta accurate, from 3-15 gallons. The left one is the second one I've installed, after triple-checking dimensions, and still it is hung up on something and does not change. I should have confirmed functionality while the tanks were open. I thought I did, but I guess not.
That being said, my fuel flow totalizer is always accurate to within .5 gallons or less, and is what I go by. I still plan on re-doing the left float again, but I consider them much less useful.
Chris