After reading Saturn's Children recently, and thinking it was his weakest novel, I was wrong. It is certainly Iron Sunrise, so the former needs correcting.
This story of Eschaton agent trying to stop a planet or lots going Kabloeey is perfectly serviceable, and I definitely don't regret the time spent reading it. Certainly not as good as the first of this pair.
In fact, I'd call this one a 3.25, which is pretty much my garden variety average novel rating over the lot of them.
It quite possibly suffers in comparison to all his other work, and the copious amounts of brilliant inventiveness on display in those books. Iron Sunrise is a fairly standard-Omnisomething Eschaton monitors aside-sf adventure. People that prefer that sort of story to something like Lobsters or Accelerando might actually want to choose this one as their introduction to his work, perhaps, to get a little of the flavour, if not the full hit.
(call it 3.25)
3 out of 5