Bruce, I can attest to how comfortable the suspension is on this pack. I used my stock Kelty Rewing to carried my Nikon camera, 3 lenses, tripod, filters blah, blah blah, all through Patagonia this past November. It was not modified like the ones your are offering. I wish that mines had been modified, but it still worked great and allowed for me to carry extra layers for the cold wind and snow plus my packed lunch each day! I would highly recommend that folks take a serious look at you pack!
Where were you when I needed you? I think you have a winner!!! Good luck.