I owned the the ATACR 4-20 for a few hours and sent it back without mounting it. FOV / and appearance of a black ring on outer edge of glass was not impressive. I've owned all the ATACRS and still have a ATACR 7-35 and ZCO 5-27. Love them both. Both are like looking at / through a high def TV. I just see glass/image, no edge of scope tube or black ring. ZCO depth of field and clarity besting the ATACR (ATACR is still great). ATACR FOV is better vs ZCO when on the same mag setting. I also prefer the ATACR MilXt reticle's thickness (thinner than ZCO). Really love the floating center dot in both. ZCO 4-20 is up next.