Justin in California said that he got the foam gliders for his 3 boys, but it’s clear that he gets as much of a kick out of flying walkalong gliders as his kids! I also like that his video shows that the gliders are slow and maneuverable enough that you can fly them in a house–not just in a school or gym.
Justin made and flew one of the paper rotating designs first before getting foam gliders. Paper is free and people who work with that kind of glider first seem to have a really easy time with foam gliders–even if they struggle with the paper ones.