I have had three, the first went back because the factory rep wasn't honest about the mildot size.(this was the discounted one from swfa, they were honest) The second, 4-16x50 went back because it lost zero after 55rds on a stock .308. The third i still have, a diamondback 3.5-10x50, it has about a 100rds of .243 through it and so far, so good. I should say that the first two were crossfires. blue