I enjoyed reading this book. I love Tris and Tobias' relationship and felt they grew as characters.
The ending left me in utter disbelief and shock and sadness, and in fact had me on the brink of tears. It was so unexpected that I didn't think it was real for quite some time, until it was further elaborated.
It left me with a certain emptiness that I am not sure will go away anytime soon when I think of this series.