I teared up a few times while reading this book, but the only time I actually cried was when Hazel told us Augustus had died after his pre-funeral. I wasn't prepared for that to come so quickly, which I'm sure was part of the point of putting it so bluntly.
I had expected it to end mid-sentence like An Imperial Affliction, and I was sort of disappointed and relieved that it didn't. Also, I read it on my kindle and when it ended I was expecting another chapter... but then it was just over and I thought I'd hit the wrong button or something but no, it was done and there was no more.
Also, I thought that Hazel was going to die! (This is a spoiler alert for Julie's Curtain Call, actually) I went into this book thinking that it was going to end with Hazel's present tense death like Nick did in Curtain Call! I think that was because I'd seen Julie say something about the ending to that story being inspired by another book, so for some reason I'd assumed it was this one. (Which now I realise wouldn't have made sense with the timing, I think) But I liked the open ending that mirrored Hazel's discontent with An Imperial Affliction, and I'm glad John Green worked that into his own ending. Besides, it's quite clear that Hazel will die, and we did get a bit of closure with what would happen with her parents afterwards.
Also loved the twist of Augustus being the one who died. It was so sad and completely believable. I think sometimes twists like that come off as the author trying to throw a wrench into things, but this came off very naturally. I think I am going to have to re-read parts of this to look at how Augustus acts after he's found out he's going to die, but before he's told Hazel.
Basically, this book was an incredible read. I really enjoyed it!