ACOG is not new.....maybe I missed something and they have a new model you are specifically asking about?
They are expensive but most folks that own them will tell you the really like the optic. Me, I can't really afford them and the fact that the tritium fades over time is something I personally didn't care for....though they can be "recharged" by sending them back to the factory. Tritium is a radioactive (isotope IIRC), that gives the reticle the "glow" to be able to see it in low light (or day light for that matter). I'm not sure Trijicon is using Tritium in the ACOG....I'm just guessing that they are along with fiber optic technology to get the illumination.
With the battery life of an Aimpoint being 5 years or better on many models, I don't see not using batteries as a big selling point for the ACOG. I personally consider red dots for close in shooting....fast target acquisition. Ya, I can shoot 200+ yards with an unmagnified red dot, but I'm not going to be printing any kind of group.....just hitting a man sized target. That's the advantage of the ACOG over a red dot like a standard Aimpoint or EoTech......ACOG has magnification available depending on the model you choose. With a regular red dot, you have to add a magnifier....and most of those are limited to 3X.
Personally, except for the battery life, I like the illuminated reticles on scopes like the Leupold VX-III 1.5-5X20 or if you've got the money to spend, a Short Dot from Schmidt and Bender....but the price is really prohibitive on the S&B.
I'm re-reading this and it seems like I'm against the ACOG.....I'm not. They are a really high quality optic. I'd love to own one, but IMO, they are expensive if you just want/need a red dot. If you want/need magnification, then they are a great option but they are a fixed power and you have to decide what you need. A variable power scope with an illuminated reticle may meet your needs as well.....or even something that has two power settings like the IOR Valdada Pitbull for example for around the same price as the ACOG.
I say if you can afford it, go for the ACOG. I highly doubt you'd be disappointed.
I'm sure someone that knows more about them than me (I know very little about them) will be along shortly to help out.
Good luck and let us know what you decide.