I had the Kuiu harness a few years ago and sold it once I saw a review of the Outdoor Vision harness on YouTube. I've been running the Outdoor Vision harness with my SLC 10x42s for the last year and absolutely love it. It's very similar to the Kuiu harness, but OV has fixed all the issues I had with the Kuiu harness.
One hand operation for getting your binos in or out, AND for getting things in/out of the side pockets. Most harnesses you need both hands and a crowbar to get your wind checker in/out of the side pocket, but not with the OV. Plus, there are two additional zippered pockets (one on the front and one on the bottom) of the harness, and a built in rain cover. It fits under my pack without issue and breathes really well too. After hiking through the thick forests of ID chasing elk, the Kuiu would be filled with leaves, branches and dust, which was so annoying. With the OV, I rarely if ever get any leaf/branch debris inside my harness as the lid better protects the harness and my binos. The OV is small and sleek, never interfered with any of the thousands of shots I've taken while wearing it.
The two guys I elk hunt with (one ran a Kuiu one ran an AGC) both tried mine and have since bought the Outdoor Vision harness.
Just a heads up, order the OV harness from Black Ovis, or from OV when they have them in stock and can ship immediately. I ordered my OV from OV last October, after I'd gotten home from my elk hunt and had sold my Kuiu. Their website said expect a 4 week delay in getting the harness and since I wasn't in a rush to get it, placed the order knowing they were busy (since it was hunting season). 8 weeks later I still didn't have the harness and hadn't received an update either so I sent an email inquiring about the status of my order. I got a smart ass response from someone at OV (which really pissed me off) and didn't end up getting the harness for two more weeks (10 week wait time). Based off of that experience, I was not impressed with their CS. The two guys I hunt with ordered their harnesses from Black Ovis and got them right away without issue.