It's been a troublesome start for Peak Design, they made some rather bad design and manufacturing mistakes for their first versions,,,
The latest version of Peak Design has a clear color indication when and if they need to be changed due to wear;
When the first the black outer layer is worn down a 2nd yellow protection layer will become visible, that means you should replace it ASAP, the core is red, if that is visible you are at the limit and replace it immediately.
They work quite fine, as with all straps keep an eye on them,,, the snap on and off works really well and has a solid feel, I use it on all cameras and even my big heavy camera bag, D850 SB910, 24-70mm AFS VR 2.8, 80-200mm AFS 2.8 and 19mm PCE plus verminous other lenses and stuff.
The key point is to make sure the lug you mount them on is free of sharp edges,,,