I am biased since I already have an Armalite, But I am interested to see how this does, especially since it is a piston. I am also glad another big name is running with that version.
While it is unfortunate that there are no Pmags, Armalite is running group sales on mags that end up being fairly decent. I have also herd that the Gen II mags are really good. They also come in 5, 10, 15,20, and 25 round versions. Hopefully at some point, Magpul comes out with an Armalite compliant version, but until then, the Gen II mags will work fine.
It is also not like Armalite is some small nitch player in the 308AR world.