I have Schallers on all of my basses except one, which has the Dunlop locks (a Nordstrand Nj6, which, I might add, is currently for sale). To me, the Schallers are the superior choice. That said, given my Alembic sixes are on the heavy side, the strap button tends to wear over time so they no longer lock. You'll know when it starts to happen, and it's best to replace the button sooner rather than later to avoid an accident. I've also had to have my primary six drilled and doweled several times over the last 25 years as the wood doesn't hold even the longest screws forever if you use the ax frequently.