The pace of the story is quite compelling, and the description of the Anti-Causal event that let loose the Iron Sunrise is definitely fascinating.
However, it seems to me that Stross has many, many, many ideas...but somehow ends up properly developing just some of them, losing others along the way.
I think this is clearly expressed in the finale. Like in Singularity Sky, all the sub-stories come to a common closing scene that happens in the span of a restricted space and time. I clearly felt the rush in the narration, as if there were only a few dozen pages left and there was the need to bring the story to a conclusion. It felt a bit like watching a good hollywood action movie, with a kind of "final confrontation"...well, you know the drill.
I think the book may have benefited from better planning phase, maybe leaving out some ideas and saving them for future books.
I know my comment just focuses on the weak aspects of the book. But it is because I really like the way Stross writes, and I can't wait to read something even better then this!
Time to shift to ACCELERANDO ...
***WARNING, SPOILER ALERT***
Just to mention a few: What of the dissident ReMastered? What of the not-so-godly-Herman? The insight on the potential weakness of the Eschaton is left hanging in mid-air. It is one of the best ideas of the setting, but after his last message to Wednesday we don't hear anymore about it. Left this way, it just seems an excuse to provide a credible background setting to the Remastered, whose sole existence should be enough to get their planet nuked from orbit by the so called weak-godLike-entity.
The somehow open finale which leaves the reader wandering about the fate of Earth, seems more like an excuse to employ the same characters again. I would rather see Stross create and introduce new ones, I feel Springfield and Mansour already gave whatever they could to the story...I don't feel there is the need to turn this into a "spy-story-couple trilogy".