*****I BELIEVE I PROBABLY INCLUDE A LOT OF SPOILERS IN THIS OPINION POSTING, SO BEWARE READING ANY FURTHER!!!!!*****
This is the last warning... I've read the entire book, and I'll try to talk around specifics, but there will almost inevitably be spoilers.
In anticipation of the release of "Shattered Hourglass," I re-read the first two books, finishing up "Beyond Exile" just a week before starting "Shattered Hourglass." I, too, missed the journal format of the first two, but I can understand why Mr. Bourne had to go to a different format in order to cover the ground that "Shattered Hourglass" covers. It was still a great, GREAT book that I thoroughly enjoyed. In the first book, it covers the continuity of government in a "by the way" statement of the remaining portions of government evacuating to an area in Utah or Nevada (I think... I can't remember the specifics already; I marked it in the first book when I ran across it, but didn't go back and look afterward because "Shattered Hourglass" covers the COG well enough, IMO).
Remote Six was wrapped up pretty well, I think. They certainly ended pretty un-ambiguously. I think their purpose was pretty well spelled out, as well as their origin. Quite honestly, I think God had gone completely rogue, though, based on the statement about his plans for a new society post-apocolypse. And it would appear quantum had reached the technological Singularity, realized where God was going with his plans, and was responsible for the downfall of Remote Six. Well, responsible for the downfall was pretty unambiguous as well.
The last chapter or so was really confusing, and quite honestly, while doing a pretty good job of wrapping things up (with only a few strings still hanging out), it left me un-satisfied. What was the deal with CHANG? Where did he come from? And what was the talk from the HUMINT of mental stress or headaches by the researchers at the Chinese facility. And how did the cyber-counterattack by the Chinese play out. Did that have something to do with Quantum reaching Singularity, or was that just a thread left hanging?
What was the deal with the ice cores? Why had the military been searching the ice for apparently years prior to the setting of this series? And as for the research facility, I'm guessing with the Virginia transitioning north (I think it said), the last two in the facility made it to a pick-up point.
Overall, though, an extremely good read. I very much enjoy Bourne's writing style, whether in the first person like the first two "Armageddon" books, or the third person like the last. I would be extremely happy if there is an offshoot to the "Armageddon" series, or even an unexpected sequel. "Shattered Hourglass" certainly left that possibility open.
Oh, as regarding another question on the thread here, yes, plenty of zombie killing, not too much Chinese. In my opinion. I would ALMOST say it is the best book of the series, but it is a toss-up for me between "Shattered Hourglass" and "Beyond Exile."