Read my full reivew here: cameratown.com/reviews/carryspeed_CSPROII/
The Carry Speed CS-PRO Mark II and FS-Pro is one of the first sling strap systems that allow you to continue to use your regular quick release plate, making it easy to go from hand held to tripod. I have tried a few straps over the past couple of years and ultimately none of them stay on my camera since they get in the way when using my DSLR for video. Yet for photography I hate walking around without one. The Carry Speed sling strap system allows the best of both worlds. You connect the sling strap mounting plate to your camera. Thanks to the offset ballhead strap attachement, you can continue to use your tripod's quick relelase just by mounting it over the straps base plate. Now you can easily attach the strap when shooting stills, and just as easily remove it when shooting video - all without having to unscrew plates from the bottom of your camera.
The FS-Pro version includes a folding mini ball head connector, making it compatible with virtually all video heads. The F-1 folding plate is also arca-swiss mount compatible without having to attach your regular arca-swiss plate.