I have the NX8 and it has a 30mm main tube the ATACR has a 34mm tube so its a little better, but it is also heavier NX8-17oz ATACR-21oz and cost almost double at $3700 plus tax vs $2300 plus for the NX8. I have a Trijicon RMR mounted on top of my NX8 angled at a 45 for close range, so the small eye box hasn't been a big issue for me so far.
I am currently in the market for another LPVO, I am on the fence between a Khales K16i or K18i, or waiting for the Vortex 1-10 but that is going to be in the $3000 plus price point so it will have to be great for me to choose it over the other $3000 options. I want to wait to see how it looks in 1x compared to 10x before I make my decision. They seem to be the first to do 1-10 so I am interested to see how well they pull it off