My experience was wandering zero, heavy for its size and dim glass. I picked one up when SG had them for sale. I had originally ordered an I.O.R. from Brownells, but it was back ordered. When it finally arrived I compared them side by side and there was no comparison. The I.O.R. was crystal clear. On top of that I also noticed the ATN had a crack in the lens. I finally sent the ATN back to SG and kept the I.O.R..