Forums / Gun Discussion / Nikon M223 3-12x42 BDC $300.00 cash, worth it? Anyone shoot through one of these?

Specifications for Nikon M-223 3-12 x 42SF Water Proof Rifle Scope:
-----------------------------------------------
Actual Magnification: 3x-12x
Effective Objective Diameter: 42mm
Exit Pupil (mm): 14.0-3.5
Eye Relief (in.): 4.0-3.7
FOV at 100 yds (ft.): 33.6-8.4
Tube Diameter: 1 in.
Objective O.D. (mm/in): 49.3/1.94
Eyepiece O.D. (mm/in): 44.0/1.73
Length (in): 13.1
Weight (g/oz): 565/19.93
Adjustment Graduation (1 click): 1/4 MOA
Max Internal Adjustment: 60 MOA
Parallax setting (yds): 50 to infinity
Sunshade: ARD

This scope also has the cantilever mount with it and Tactical Caps on the Knobs. The person put it on his AR and found that it just isn't enough for his eyes and shoot 600 - 800 with his custom Long Range AR build. He's in his late 50's early 60's and knows his eyes are only going to get worse so he offered me a deal on this setup. Just not sure and wondering if anyone has owned or knows of someone who owns one and what kind of results you/they got with it?