I didn't read this one quite as quickly as the first one, but I finished it today.
This is an interesting one. It's way more "military sci-fi" than the first one was, to the point that I was starting to wonder if it had been stealth-published by Baen.
It also definitely paints the Chaonians in more of a gray-light. I can't figure out if it was doing that on purpose or not since they still seem better than a lot of the alternatives.
So, not as good as Unconquerable Sun but still quite good and I wish I could keep going. Sadly, the third isn't expected for a couple of years so I guess I'll need to find something else to tide me over.