I have a collection of basses, and each one has an Italia 4" strap dedicated to it, that never comes off. No straplocks here!
These straps are the best. They feel so comfortable so my shoulder doesn't hurt even after many hours with a heavy instrument. The suede back is great since I don't like the bass to move. If you do, get the leather-backed model.
I've been using Italia for many years, and I will never use any other strap. They just rock.