Fit and finish are perfect, diopter and focus are smooth. And the real test is the edge to edge, and I will say it's excellent. There is a very thin blurry edge, the only optic I've used that does not costs 3 times more (Swaro).
Field of view is great with the 80mm lens, brightness and contrast are also very good. If I had to say anything negative it would only be weight, it's only a few ounces less than comparable units maybe it could get lightened up a bit. If I had a choice for options, I would want easy replacement eye pieces, perhaps with a ranging reticle, but I know that's a small market need.
Overall a great optic all around