If you want big eyeboxes beyond the HWSes, there's also the SIG ROMEO 8H/8T, DI Optics DCL30, and the Steiner DRS 1X. The Leupold LCO, too, if you can find it.
The most curious part about the AEMS is how light it is for its window size; it's between an Aimpoint T-2 and CompM5 in weight, while over half the weight of the comparable RDSes and HWSes if looking at window size. Wonder how well it will hold up.