if "100% success" means "i can snap them off with my fingers, but it takes a bit of effort"  to test roadworthiness, hand them to the gorillas at your nearest zoo. they'll treat it better than your average roadie... (not that i have roadies, well not paid ones)  or try the mackie test, run over it with a truck!  ok, ok, i'll stop.  but anyway, once i drilled the corners on the 6582 i was satisfied with it's toughness.