I do a lot of bird photography. I carry only one camera body (Nikon Z8 with a long lens). Recently I have begun bringing a set of binoculars as well. The 3 Cam system is just what I have been looking for for this loadout. I carry the camera on a slide sling and the binoculars at the third camera position in front. This puts the binoculars in the preferred position and the camera and binocular straps never interfere with each other. I also like being able to switch the camera from one side to the other if fatigue becomes an issue for one shoulder or the other.
The build quality is excellent. The quick release connections work well and seem secure and easy to use so far.
The only minor nit is the length of the main strap elements. I ordered a medium but the straps seem to be at least a foot or more too long even when extended to use with a heavy jacket. But this is not much of an issue as I tuck the extra strap length into the provided elastic sheaths.
Overall, this is a great system for birds and wildlife when you wish to bring binoculars as well as a camera.
Thanks!