The eye box is the weak link with Athlon.
Many other things to like (clarity, repeatable dialing, durability, price point), but the eye box is as bad as they come IMHO. I will not be buying more until that matter is solved.
I'm curious about which particular scope you are referencing (and what you are comparing it to) ???
I switched from an ATACR 1-8 to a Cronus 1-6 on my 3GUN AR when I started working at Athlon and have found the eye box to be more forgiving on my Cronus.