Received this a few weeks ago, mounted it on a 300wsm and have put around 30rnds down range in mostly cold/damp weather. It is very crisp and clear glass and no fog issues. All the adjustments work very smoothly from magnification to the parallax adjustment. So far I'm very happy with this purchase. I'd prefer US made products but heard great things about Athlon and on Guidefitter the price is definitely right. May not be my last Athlon purchase...