Tek-Loks are great - I've used mag pouches w. them for years - and holsters, in competition, but I don't tend to carry OWB, very much*. They work great on my competition holsters, but I don't abuse those nearly as much as I do my carry holsters. (Unless I carry AIWB, which I do, mostly, these days, I tend to slam holsters into stainless steel corners, while running, on a, somewhat, routine basis - although I haven't had to run to hit a kill switch since the power company, finally, tracked down their supply issues...)
*I have a Looper Gun Leather hybrid holster (leather-covered kydex), which I'm very fond of, but it doesn't use a Tek-Lok.