I also have four of them. Mine work just fine, and I don't plan on selling them. Any scope maker can let a bad one slip through. At my clubs tactical rifle shoots, quite a few shooters use Shepherd scopes and they do very well.
I usually hunt with a scoped Springfield Armory M1A. It weighs about 12 pounds and doesn't seem heavy to me and I carry it all over the place. I also hunt with a Savage 10FP .308 with a 24 inch barrel, it doesn't seem heavy either. A friend from work took his Savage 110FP .300 win mag elk...
I use Shepherd scopes a lot. The reticle will range out to 1,000 yards. The farthest I have shot mine is 600 yards. It is not really made for target shooting. As far as optical clarity, I do a lot of hunting in the dead of night and there are not too many scopes that can see as well. As...
I have shot a number a wild boars with Sierra 150 gr SBT gameking bullets out of a .308 winchester and never had any performance problems. All, but one, dropped where they stood with one shot.