I have a 3" 66 and a 5" 686+ that have the Hi Viz/V noch rear combination. They are RSR specials, I think. Neither has a red element. The 66 is green and the 686+ is sort of International Orange.
I thought the combination might work a little better than the standard post and square noch for my somewhat senior eyes. In practice though, it's just too slow for me. The front sights are great, and I intend to keep them, but the V noch needs to be repalced.
XTrooper started a thread on the C&S fixed rear sight that gave me some ideas for replacement, but it doesn't address this sight combination directly. If you haven't seen it already, it might be worth a look.
Question For Night Guard Owners
Charles