This Company story carries on from The Life of the World to Come and pretty much is the final chapter that I wanted in that book. I guess it makes sense to split it if it took a whole extra novel to do this, but the previous one still felt truncated.
In any case, generally good stuff in the vein of the other novels. Some parts seem a bit bogged down in left over plot threads from the previous books (this effect is accentuated by the time travel). And the endgame isn't quite ready yet, although it feels like Baker's getting pretty close to giving us the story of the Company's fate after 2355 (the year after which they have no information).