I have had four; one NX and three BR; all used in competition. I luv them. I bought my first 12-42 BR model used, and soon learned that it was not tracking well. I called NF and told the nice lady what it was doing and that I bought it used. She said send it in with a letter explaining the problem. I did so, and about 9 or 10 days later, the brown truck was in my driveway with the scope. Not only did NF repair the tracking problem, but they paid the return postage. I know of no other scope manufacturer with this kind of service.