I did research on CR and if you recall I was asking about Pacsafe versus Black rapidThe narrowness of the Peak Design strap did concern me at the start, but at event work I may carry two-three bodies, a fairly weighty 1D MkIV with 70-200 f/2.8isII & 580EXII on one side and a gripped 5D3 with 24-70 f/2.8II & 580EXII on the other and maybe a nice light, tiny 100D/SL1 with a very bright prime around my neck.
Peak design strap is too narrow (from what I see) and I have a feeling that it will pinch my shoulder when I will put heavier lens.
Over a 3-6 hour event, of course I am aware of the weight of the 1D MkIV and 70-200, but no more so than I was with standard straps or the doomed CarrySpeed straps. This was a surprise to me. It may have something to do with how well balanced the camera & lens are when it's at my side. I have one Anchor on the regular strap mount and the other hooked into the Peak Design Arca Swiss compatible plate on the lens foot. If I need to switch to monopod or tripod, it's a 1-second changover to move the strap to another Anchor, usually one on the camera base plate. On each body I have Anchors on each of the three strap attachment points. Longer lenses with a foot have a plate which is able to have an Anchor hooked into it.
Yes I know your original question was CarrySafe vs Other Straps. There are a LOT of Other Straps, each with their strengths and weaknesses. I spent far too much time last year researching the plethora of options, ruled out a lot of them, blew my money on CarrySpeed and finally landed safely with the totally unexpectedly excellent Peak Design stuff. I didn't see the CarrySafe products last year. From the photos they sure look OK.