I have an ACOG, one of thr earlier gen 4x .223 units with the fiber optic. The glass quality and Window box of viewing is beyond amazing.
That said, as a general purpose rifle that will include 10 yard CQB, 4x is just too much fixed magnification. I ended up switching it out for a fixed 2.5X CQB other brand (Primary Arms). That gives some magnification, yet will still CQB. And isn't obtrusive large and heavy, like a LPVO. I'm the one guy in the room not sold on LPVO's.
I did move the ACOG to a more dedicated Grendel field hunting gun, where <10 yard shots are not in the mission statement.