After having terrible luck with the plastic squeeze connectors that Op/Tech uses, I will pass. Bumping into anything with my backpack and a tool case I have that uses them springs them open at the worst times. I have them on a duffel bag I use for flying and have to secure them with nylon tie straps to prevent them from opening during baggage handling after it happened so many times.
For my camera, I only use the Black Rapid RS-5 because the camera is heavy with the longer pro lenses/flash/grip/modifiers which would be a bear to carry all day without it. I can carry it for hours without noticing the weight and have it at my eye in 1/2 a second, faster than any neck strap. It also leaves two hands free giving great stability over rough terrain or in crowded places. Besides I can't afford to replace a damaged or stolen camera/lenses if I used a standard strap.