I used to use neoprene strap for heavy binoculars, but I have switched to Rick Young Outdoors (RYO) harness. I also use it for lighter binoculars as well. I bought some extra clip on connectors so I can quickly and easily move harness from one binocular to another. I always keep one harness on a binocular in my car and the other harness on whichever binocular I plan to use for a given outing.
The RYO harness is comfortable, and the binoculars don't bounce or swing around--they are always right there to quickly get on target.
Alan
Harnesses are indeed more comfortable if one is carrying only one binocular, but they don't play nice with backpacks or other optics gear. I gave up on them because of that, bandoleer style straps are almost as good and easier to deal with.