After having an older OP/TECH strap fail on me one day (one of the nylon sleeves that holds the loops for the webbing part of the strap broke at the holder for the neoprene strap, causing a Nikomat FTn with 105/2.5 start falling toward the ground), I started switching to the Domke Gripper straps. That was more than five years ago. At the moment, three of the four Nikons I own all have the Gripper straps on them. The F4s, one of the rare Emerald Edition 1" wide straps, and the F2AS and F5 have 1.5" wide black straps. The F recently received a brown neveready case, complete with original leather strap, so it wears that now.
-J