Shades of Earth was pretty amazin! There is so much going on, and it's just a wee bit creepy because you don't really know what's going on. The details of Centauri-Earth are really good (and that's why it was so creepy). There were some things that were pretty easy to figure out and other things that completely blindsided me (one of which if you pay close attention to in the beginning you will get, but of course I missed it). Amy and Elder struggle a bit, which is good, and Amy also has issues and arguments with her parents. Things keep getting mysteriouser and mysteriouser (there is a really good LOST vibe in Shades of Earth) and there are so many secrets! 
 The last 1/4 of the book is where a ton of action happens. I almost feel like the ending went too fast, but at the same time I know I was reading fast because I had to know what happens so that could be why I felt that way. Not everyone makes it in Shades of Earth and there are some that I wish wouldn't have died, though after sleeping on it the deaths made more sense, but that doesn't mean I have to like it. 
 It's sad to say but the issues that happened on the new Earth are something that I could totally see happening in real life (you know, if we found another liveable planet)because you see it happening in some countries right now (though not nearly to the degree that it happens in the book). Shades of Earth displays some of the worst of humanity at times, especially concerning the FRX (they've been nothing but trouble since the beginning). 
 I wavered between giving Shades of Earth 4 or 5 stars. I had some problems with the last 1/4 of the book. I know this is going to sound completely ridiculous, but it just got a little too sci-fi for me. (Note: yes I did know that it was a sci-fi book when I read it.) I can't really go into detail without spoilers but I just wish it was a bit different, but at the same time Revis could have gone in a different direction and that would have probably made me not like the book at all so I'm glad she went in the direction that she did. I did like the ending, though a part of the ending felt like it was tied up in a neat little bow for us and I just don't think it would be that easy.