Overall, I have found Sightron scopes to be excellent and a good value in terms of repeatable turrets and clear glass. Like most manufacturers, some models are better than others. I love the SIII. Never had any problems with them. I still have the SIII 6-24x50 on my 6.5-06AI. I also have a discontinued Big Sky model on my lightweight 243. I chose this scope because it was one of a very few scopes out there that had a 1" tube (think less weight), a reasonable elevation range, and a paralax knob (this was a biggie). It replaced a Leupold scope that had no paralax (so thungs went out of focus beyond 500 yds. My only complaint with this model was the smaller knobs with 'mushy' turrets. Not pleased with them, but glass and paralax was enough on the positive side to keep the scope on the rifle.