I loved the book, finished it earlier this week but forgot there was a thread about it here.
I am actually reassured after reading it, after learning she was writing 2 more books I was scared that she would stretch storyline forever and have non plots (like the 3rd Shades of Grey series), but she started tons of new plots and subplots by the end of the book so we should be good.

Introversion, I think she has enough material with