Used them a long time ago and was underwhelmed too.
Best luck I have had- Bontrager Hard Case.
I agree that there are a multitude of factors associated with flats...........
Do people run their tires very inflated? Unless I run them at 75psi or higher it feels like I am riding on a balloon...........

Would autos be so popular if every other week one had to change a flat?
I would think a major innovation in bikes would be tires which don't flat............