I do love my ACOG (TA31RMR-G-CH), what I don't love is the eye relief (1.5in) of the TA31's. Take a hard look at the TA11's with an eye relief of 2.39in, it helps a hell of a lot.
I'm so in love with them that I'm saving for a TA26SG-10 with the plan of putting it on my new AR pistol (Roxie)...