Interesting product concept, I haven't come across it before, but from the demo video on their website the camera bodies seem to hang a little low for my liking - possibly making it prone to getting jostled when moving quickly. I use the BlackRapid Double Strap,it doesn't have the quick release capability, but I find that my cameras feel very secure when running (even with a 70-200 attached) because the cameras rest against my hip and small of my back, rather than against my thigh as appears to be the case with the spider holster.