I have a Manfrotto tripod mount and was concerned. However, this guy on his motorcycle doesn't seem too worried about a D ring/tripod mount with his R-Strap...
http://www.youtube.com/watch?v=fSCM9eaIKuo
I just came back from 3 weeks overseas (I know, yay me). Used the RS2 strap every day, all day connected to the D-ring on the bottom of my Manfrotto RC2 quick release plate. No problems or worries, never looked like releasing or loosening. First few days I was keeping an eye on it, but after a while I gained more confidence in it. This was with the original connector, too. I've ordered the new one, but hasn't turned up yet. Gear it was holding was 30D (no grip) and either 17-55 or 10-22 lens. Don't reckon I'd have a problem with 70-200 or 100-400 either, although I'd use the tripod ring with RC2 plate.



