The Good: The ACOG is a great platform and this model would almost be a 5 star on it's own. The optic quality when compared to Eotech is much better.
The Bad: The only problem with this ACOG model is the eye relief. They do make a model that has better eye relief but it's bigger, heavier and has 3.5x magnification. I dinged this particulat product a star because I bought the model with the RMR on top. First, the RMR is mounted on the rear of the ACOG which makes it too close to your eyes. Because it's mounted on top of the ACOG so high above the barrel, it creates greater parellax on the trajectory vs. sight line. e.g. when the RMR is zeroed in at 25 yard, it shoots over an inch high at 30 yards and shoots an inch low at 20 yards. I realize a 4 moa red dot is for center of mass shooting and not supposed to be that percise, but over an inch for +/- 5 yards is pretty drastic. Because there are 2 sights it may take a second or 2 to transition your head position for variable ranges.
Also be aware that the balistics of this ACOG is meant for a rifle size AR-15. There is the USMC version of this product for more $$ that has balistics for a 16 inch barrel. I have a 16 inch barrel but figur that won't really matter within the range I shoot.
Overall pretty happy with the product. It's nice to support multiple ranges. I can get 2 moa groups at 100 years on a bench or shoot red dot style.
Pros: optics, battery life/lack of, multi range, 2 eyes open