I had high hopes for this book based on the reviews, but it has a STUPID underlying plot device, and it gets pretty boring as you get deeper into the book. In addition, the actions of the characters are so implausible to make the book unreadable.
[DETAILS - WITH SPOILERS - WHY I DIDN’T LIKE IT] The whole concep that they would initially use clones of real people (with the same name and “character traits” as their Earth-bound “parent”) to crew an interstellar spaceship is a stretch at best....but the whole underlying plot device — that there is no breeding among the crew during a multi-generation ark ship, and that each individual clone would each be replaced with their identical (ie, clone) replacement....and that the new clone will take over the same job as the prior clone after a pre-determined number of years (whereupon the older clone is simply euthanized) — was so illogical, and became so unbelievable as the “generations” went on, that I simply gave up and stopped reading the book about 2/3 of the way in.
Overall, the concept had promise initially, but the author took an interesting idea to an extreme, making it beyond believable (and at that point, it just becomes dumb). I gave it two stars, instead of one, because it started out OK and even has potential...if the author were to go back and modify it significantly.