Yup, I wasn't saying they weren't good, just never seen them before, and surprised there is no bonding agent.I have had trucks ALL my life with GOOD tire Wear Always....Run...35 Pounds all Four tires year around....Check them every two weeks.
I've also always done all my own tire service. I have put dozens of straight folded rubber or folded dipped-cord plugs in, and never had a problem with either.
Anything that works is good, but the traditional method allows for plug stacking in emergencies, which doesn't look doable with mushroom plugs. Without having used one yet, the only benefit appears to be slightly cleaner with no cement or vulcanizing agent to contend with, but a little slower and requires a the special tool.
I'll stick to folders until I have reason to change.