I have two nx8 scopes (2.5-20 and 4-32) and overall I like them. Optically speaking they're not a perfect scope, you'll probably find some of those draw backs if you search the net. The optics are still good, just may not beat out others at the price point. I had pre-ordered mine and did send the 2.5-20 back due to optics (outer ring), it came back a lot better. I really like the small footprint of the nx8 scopes and therefore I use them.
I still remember shooting at the range with my first nightforce scope and being amazed upon adjusting the turrets that the bullet impact changed exactly what I adjusted. I've been a believer since. Mine are FFP, and so far have harvested a number of animals using the nx8.