The DR-1 is the ultimate solution for two-camera shooters. Ergonomic and sleek, it works with Black Rapid’s MODS system of attachments so you can customise your strap to your exact needs. One side can even be detached for use as a single R-Strap. Simple, fast, and intuitive, you’ll wonder how you lived without it. The R-Strap is the most innovative camera strap ever to hit the market.This patent-pending piece of equipment offers unparalleled ease of access to your camera and peace of mind.
Strengths: I bought the double strap for running around convention hall floors. I generally carry two cameras when working an auto show - my main camera with a 12-60mm lens and a second body with a longer zoom. Carrying two cameras on my shoulders using traditional straps cause my shoulders to tense up and I end up with awful upper back and neck pain. I'm also generously endowed, so if I cross the straps across my chest, well, it draws unwanted wide-eyed attention. This system takes away the "cross your heart" effect and distributes the weight across my shoulders more evenly, and I don't tense up and have the resulting stiff neck. It's also solidly strapped on you, so in other situations, e.g. walking around outside with your camera, it's harder for someone to come along and steal it off your shoulder.
Weaknesses: While I can adjust the length of the straps, the cameras can get a bit bouncy while walking. If I decide to use only one camera, I haven't figured out a way to secure the empty strap, and it pulls a bit without the counter-weight. It's also more expensive than some camera bags, let go of my arm!
Bottom Line:
The system, while expensive, is a comfortable way to carry two cameras around with the confidence they won't slip off your shoulders. (Note price below: I made my purchase several years ago.)