I have 3 of these on 3 different cameras. They are awesome! You can even fit an extra battery in one of the pockets in a pinch!
I used it on a Nikon D200. It felt like the weight of the camera was stretching the strap. When I walked with it slung around my shoulder, it felt like a yo-yo. But the worse part was that it did not have a non-slip surface and the strap was constantly slipping off of my shoulder.