I've read it at least three times, with varying experiences.

I think the first time I wanted more of AFOtD and didn't quite get it, but did get lots of other great stuff (particularly programmer-archaeologists who still knew about the unix epoch), and just want along for the thrill ride.

Second time I was focused on the Focused, and got a bit blindsided at the ending.

Third time, I read it quite slow and found a lot of things I'd not found before, including the exquisite way the last quarter was put together.