Legend was a pleasant surprise. It was a pretty fast read, but not too fast. I really liked the fact that Lu built the Republic one little bit at a time throughout the whole book rather than an info dump or quickly over a few chapters. 
 I really liked both Day and June, except for the fact that they are so NOT 15! It was mentioned a couple times in the book and everytime it was mentioned that they were 15 it pulled me out of the story just a little bit.