I've used one of
these slings for the longest time and I love it. The camera hangs by my waist and I can pull it up easily to frame a shot. I can also sling the camera behind me when I'm carrying kids so they can't reach it.
I prefer this over the Black Rapid versions because of the plate that mounts to it having an offset hole to hook onto. I've found that by placing the hook on the mount plate forward (towards the lens) I get better balance and the camera hangs upside down without causing lens creep.
The only thing you need to watch for is over time the swivel can wear and fall out, but that's after a long amount of use, and the listing I linked includes a free tether that will 'catch' your camera if the swivel wears loose. I didn't like the tether getting in my way, so I use a carabiner to secure both halves of the swivel. It limits rotation to 180°, but if the swivel wears through it will catch it right away. I was worried about the tripod screw being a weak point, but after years of use I've never had it loosen during use, and if it did I would notice it swiveling before it unscrewed enough to drop the camera.