Two and a half stars from me on this one.....because, well, I finished it, and it was a struggle - and I think I did finish it, in part, because I was curious about just how many generations out the authors would take it, and just how long they would take to end.
The story was convoluted - the authors definitely researched a lot of technology and science and filled the book with a lot of scientific terminology, but I think the story would have benefitted from a better explanation of what Ben was trying to accomplish, and when it appears that the teams succeeded in completing what he envisioned, well, it took a huge leap of faith to understand why it would work, and then his last directive seemed to fly in the face of his reasoning for such an undertaking.
And if this review is confusing, welcome to the last 25% of the book, because have questions. This was just too convoluted, and I almost regret sticking with it to the end because I still am confused as to what I just read.