I bought this at a book shop a while ago on the title alone, and I thought it was worth it.
If you know a little about Babbage and are intruiged by the potential his (uncompleted) machines had, I think you can really imagine the world this book depicts. Not just the mechanics of Babbages creations and their offspring, but the mechanics of society which has evolved along with them. Two merged Revolutions, both Industrial and Informational.
I also found the story to be interesting, but excuse me if I rave about the setting it is in most of all. :)