good for him for making something cool looking, but dang this is sketchy.

modern tubeless systems are so nice that i never worry about getting a flat on my bikes, and unlike this thing, I also never worry about them coming off of the rim, even at high speed through corners/over roots and rocks.

they stop holding air as well after a few months and i squirt some more sealant in and it's fine again. for any bike that sees real use it's hard to beat.