Don't use Jim Dunlop's strap-locks---they dropped two of my guitars. the metal pin is made of a material that is not hard enough, and it will wear over time, creating a rounded edge...at some point, the guitar will fall out. Mine crash landed twice before my third set of strap-locks became my last. The little red rubbers washers that come on bottles of Grolsch beer are the best...seriously.
Well, I do like the Dunlop Dual Design Straplocks. I've never had a problem, but probably don't gig nearly as much as hazel-rah. I prefer the way the Dunlop's attach to the strap and how you can use them as regular strap buttons, if need be.
I've been using dunlops for so long i can't remember. probably since the early 80;s. I still have the original set plus a couple more for other guyitars. But the main strap and locks i have used since the early 80's is still in use after several decades of gigging and never once have any of them broken or slipped out etc etc. They've been flawless for me, and that ione set has literally done thousands of gigs and still works perfect. I've had the shallers and they're ok, i just don't like the way they attach as much.
Dunlop Dual Design. My brother brought his guitar to a gig the other day and had no strap. So once I removed the locking mechanism, he used my strap. Then I just used the strap on my guitar for the rest of the night without the locking system. Very handy. I had a slight squeaking problem, but a little WD-40 cleared that up.