I REALLY liked that book! I think I liked it better than the other 3... 
 I've read the first 3 books early last year so I can't remember all the details so I liked the fact that it's not related too much to the first Selection. 
 In a way, Eadlyn is very similar to America and in another way they are completely apart. Both never wanted to join in the Selection and ended up enjoying it. Howerver, Eadlyn is very sure about what she does while American was always in a state of uncertainty. 
 I love the fact that Eadlyn goes through a series of emotions : denial, anger, bargaining, and acceptance. Each one is very well define and we can really see her go through the process. 
 (view spoiler)[ I hope she'll end up with Kile or Erik (even though he's not really part of the Selection). Kile is so charming and lovely and Erik understands everything she lives as if he have had the same experience. 
 I can't wait to read the last book! (hide spoiler)]