This video from Premier Guitar's "Rig Rundown" series features the bassist and lead singer of Slayer, Tom Araya, discussing with his brother/ guitar tech on what strap locks he was using on his ESP Signature 4 string bass. Tom Araya - "What um... What do you use? The Schaller?" Toms Brother - "Yeah the Schaller Locks but we're not using them anymore"more
Not much to say here. It's a sort of preference situation. I got these for around $15 at the store, stuck'em on the Swede, and they work just as advertised. Honestly, the one thing I like about these is that the pins don't look too different from the original strap pins. Once you have your strap on, it doesn't look too terrible visually (as is a factor with most strap-locks).
I really like this one, specially because it holds my precious OLP Luke model. The only thing that I think its a little annoying is the fact that you need a scissors to open up the strap hole a little bit more, and if you make it wrong you can damage forever your strap and it will be useless. But, once you do everything right, it's totally worth it. Great value for the safe of your instrument.