The only thing I can see that I have a question about is whether the "working wrench" that provides for the toolless (more like a built in tool) quick-change of the barrel will hold steady or rattle around in the handguard.
Other than that it looks like a rock solid platform. Caveman simple gas piston system, looks like a good solid stock, and I think people who question polymer lower receivers are stuck in some kind of time warp and beyond help.
Pretty much what you're looking for spec wise in a rifle. Of course, we all know how there are about a million different tolerance things that come into play in whether every part will work in concert and only time will bear out whether that is a problem or not. Looks excellent on paper. I can't think of much more you could do with the current technology of today to have a better rifle without going way off the reservation on something that probably wouldn't work. It's a very modern rifle based on conservative time-proven designs.