I'd avoided reading reviews of this because I had looked forward to it so much and in glad I did, because I really liked it. The criticisms I've since read are valid, the book's long, not super fast paced, and the romance happens quickly, but I guess I'm not bothered by any of that, because the story just worked for me... This is another author whose writing seems to have really grown over the course of several books, which is nice to see as well. I did miss the voice-y guest person POV of the Darkest Minds series, but the third person fits the epicness of this story, so I won't pout too much. 
 Oh, and thank goodness for a time travel story where the characters actually time travel.