I have had several of them, mostly vipers, psts, hst, diamondback hps etc and never had an issue. Their customer service is top notch. I have sent stuff back that was damaged due to my own stupidy or just dumb luck (horse rolling down a hill with my gun strapped to it) and they replace it no questions asked. You really can't go wrong - i have seen lots of scopes fail in the field, even a nightforce...crap happens. Every single one of mine has been machanically sound and tracks perfectish (they aren't tangent theta, but neither is S&B or nightforce).