Although I saw some of the twists coming, I did not see them all.
I'm actually not sure I ever read a book set on a spaceship before, so this was interesting. The characters were interesting and I felt bad for Amy in particular. She ended up in a pretty awful situation and had a lot of trouble handling it, but I don't think I would have handled it any better. Elder was a little more questionable for me because I found his lack of questioning to be rather annoying. The development of their relationship was interesting, though I felt kind of betrayed at the end when we found out(show spoiler)
The Godspeed had several mysteries to follow, and with two point of view characters who were too afraid to exchange information, solving the mysteries took some time. I absolutely knew(show spoiler)
very early on, and was kind of annoyed that it took Elder so long to figure it out, since it seemed extremely obvious to me. I was not expecting the other major revelation, though I had thought something was up.
It was a fun, fast ride through space, and I enjoyed it quite a bit. At some point I will pick up the sequels, though I feel like it stood alone pretty well. Exploring the spaceship and the dystopian universe that resulted from having humanity adrift from Earth for so long was fascinating and something I hadn't really read before.