I am unfamiliar with the audiobook experience, but I grabbed this back when it was new and tried to listen to it -- at the time, I couldn't pay enough attention to follow it and gave up. I considered buying the normal book version, but upon seeing the list narrators for the sequel (all Star Trek alums!) I decided to give the audio version of the first book another shot.
I liked it very much, but it is hard to judge where my impressions stem from the writing, and where they're caused by the (still new to me) experience of listening instead of reading (was that story good on its own or did the reader really sell it, etc.). Thankfully, the project was first conceived -- or at least released -- as an audio book, so I don't really have to worry about it too much.
This time around, I really enjoyed myself, although I think that maybe the order could have been changed a bit. The one that left me with the weakest impression was Bear's story, but I don't think it's the story's fault: hers and Buckell's are rather similar, and with one following directly on the heels of the other, it's harder for the story to stand out.
That said, a very neat and interesting world, with a few characters that'll really stick in my mind. Cascadia was probably the most interesting place, but the day-to-day-ness of Scalzi's story might have made it my favorite.