Wedding photographer here and on bigger shoots carry two cameras on a harness. I like to shoot from angles that aren't always possible while my gear is connected to my chest so I often unhook my primary camera and use these sweet little wristy boy to secure my gear.
Before this wrist strap, I had one off of Amazon that was a little bulkier and used an O ring I put on my camera, but after a few months the O ring started to stretch out and would one day fail me. The wrist strap by WANDRD is thinner and more durable.
I also use it when I'm using my gear abroad because if someone tries to snatch my cam out of my hands, I'm coming along with them.
Highly recommend. WANDRD's has never let me down.