I use my D700 with MB-D10 (w/ 8 AA's) and 70-200 f2.8 lens to shoot horse shows. That is a heavy package and was awful with the standard strap. I got a Blackrapid strap that distributes the weight on my shoulder instead of my neck. From rest to shooting position is one smooth motion. After the first afternoon of shooting I was sold on the system. The only weak point that I have found is that the connection to the camera can become loosened with use and has to be checked to avoid an accidental drop.