My 8 year old and 6 year old boys have recently take up Onewheeling on my spare Pint. The little guy had a hard time getting his little feet to register on the footpad sensor, the gripple solved that problem immediately by focusing his weight onto a smaller point on the pad. Such a great low-tech fix for the lighter, smaller riders out there.
On the upside for me, I get a bit more grip for better carving, its a win for the whole fam!