Take this for what it's worth. I have not used the new NF. I have and do use a 12-42 NXS and a NF 8-32 BR. I was squadded on the same target in Oak Ridge this past weekend with Laura Perry (US FTR team) who has used the old NF scopes, was using her March and has use the new NF scopes provided to the US team. She told me the NF is better than the old NF and doesn't give up anything to the March. (which really bites, because now I'm getting the "I gotta have one!" itch)
So, I'd say it's time to get one.