I have astigmatism and notices that the red dot on my Holosun smears a bit when I look through the glass. I read someone elses review that complained about the same thing and suggested the RMR, because the dot seemed to maintain its round dot shape. I have to agree with him, although I love my Holosun optic, people with astigmatism might appreciate the RMR dot a little more. This is just my experience, everyones eyes are different.