I have astigmatism too, but corrected with contacts.
The Aimpoint tends to bloom for me on power settings needed for daylight conditions. When am zeroing the gun, I turn down the power as far as I can to where I can just make out the dot and it does get sharper then. That said, I don't mind nor have I really noticed the bloom when shooting in competition or training courses of fire as at those distances, it's not like I'm trying to get super precise. I have shot the Aimpoints out to 200 yards and even then, the bloom wasn't bad to the point where it obscured a torso sized target.
In terms of crispness of the dot, I found that EoTech was the sharpest, especially with the 1 MOA dot in the ring. The Aimpoints I have now are 2 MOA. I haven't done a side-by-side in a while, but even the 2 MOA dots didn't come close to the sharpness of the EoTech.