These have been my go-to straplock on all my basses since 1992. I have some I've used for over 20 years. Never had a set fail on me. You do have to oil them occasionally, but that's a small price to pay for reliability. Give them a tug when you pop the locks into the buttons to make sure they're holding, and you're good to go. I've never lost a C-clip from a set (which holds the lock together on the strap), but even if one were to pop off during use, the strap still won't come off the instrument. I've had several bandmates use Schaller locks that lost the nuts on stage, and seen guitars go crashing to the floor as a result. Schallers also tend to unscrew the buttons from the guitars more easily than Dunlops. Other new designed locks seem to utilize Dunlop's ball bearing concept,