I have the OpTech,I find it very comfortable even with a heavy camera/lens combo, like D3/80-200. I particularly like the ability to remove the main strap for hand holding/carrying but if I got another I would get the noose ends instead of the slide buckle a-la same kind as the Nikon straps, because they are fiddly to take off/refit. I don't like straps on my camera when it's on the tripod or even worse, the astro mount, due to them getting in the way and flapping about.