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Another vote for OpTech.
Well made and resonably priced. I didn't think I would care for a cross strap until i used one. I use a cross strap (with quick release attach points) that can be converted to a neck strap. I attach it at the upper RH mount and lower mount plate on my KP and that lets my FA* 300 hang straight down to my right when hiking/walking. I have a third quick release on a carabiner that I attach to my front beltloop and to the LH mount if the camera is bouncing around too much while walking.
If I am using my primes or I am not going for a long walk, I use the wrist strap.