While I have an M68 (Aimpoint CompM2) on my issue M4, and the exact same sight on my M4gery back home, I actually prefer the ACOG. I just can't get my hands on one here in theater, nor do I suppose I really need one. I find the EOTech reticle a tad "busy" for my eyes.
Battery life isn't really a concern with the Aimpoints (over 10,000 hours with mine, and up to 50,000 in the newer ones). I'll just change the battery every year or so. :roll: The ACOG doesn't use batteries at all.
Not sure what you mean about the Trijicon Reflex's field of view. It's designed to be used with both eyes open, so field of view is essentially unlimited if used properly. If you're closing one eye, you're using it wrong.