got a vari-x II 3-9x40...forget when it was made...looked it up once...i bought it used 10 years ago...not a single issue....
and bought a new VX-II 6-18x40AOT a few years back...not a single issue and its on my groundhog rig....like BC said, if i run up 10 clicks and left 3 clicks, take the shot, then return down 10 and right 3, my zero is there...i do it multiple times on a good hunt...you wont find too many scopes that can pass the tracking test!!