Re: Nightforce NXS vs pre NSX.
I think the older models have two other differences also.
You can change between green and red color reticles, and illumination intensity is readily adjustable on the left turret, where the side focus now resides on the NXS.
Illumination on the NXS is only adjustable by taking the battery cap off and presetting it's stat, not as quick as before, but simpler being just on or off. The reticle is now just red only I believe.