I put a NXS 5.5-22x50 NP-R1 ZS HST on my R700 338 Lapua almost 2 years ago and here is my opinion so far.
-Built like a tank
-Turret adjustments are 100% all of the time
-Glass is good but not great. IMO Zeiss ( I don't own one but have looked through a few ) has the best glass, but then again I have old eyes!!
-Long, bulky and heavy, but this is why it is a tank
-Reticles available - I was 100% happy with the NP-R1 reticle until I tried a Horus H58 and there is no comparison. I hope NF jumps on this bandwagon ( only one model so far ) and starts offering more Horus reticles and when they do I will sell my current NXS and buy one. I just ordered a Leupold Mark 6 3-18x44 with Tremor2 reticle for a .308 and I can't wait to put it through its paces.
All that being said NF scopes are excellent and highly recommended!!