I gotta say, clone stories should be the next trend in Ya books, because this one is absolutely awesome! I love that the clones are connected. If one of them feels pride, the rest of them will notice. They'll start to feel it, too. The "older" generations are just barely removed from the current clones. I appreciate that we aren't told off the bat what the clones are used for. And that the clones aren't all perfect. Althea 310, one of our main characters, had to have a new hand grown for her.
When Jack is introduced, we're given a quick little history of what the clones are and why they came to be, but it doesn't feel forced. I will say, it's very obvious that Jack and Althea 310 will fall in love, but I'm not mad about it!