Well The EoTech was never intended for the AR. It was intended for the FS2000 That never showed up.
The ACOG was/is my first choice on an AR, but I am tempted to try the Aimpoint 3X in conjunction with the EoTech see how that works out. But Chances are the EoTech will be joined shortly by an ACOG. I'm not a Huge fan of batteries, but the reality is in the civilian world these rifles and accessories are just entertainment anyway so I can handle having batteries.