I was pleasantly surprised at how much I enjoyed this book. I'm the kind of person that has to finish a series once they've started it, so I've been reading the Princess Diaries series since I was eleven (2002) and have borrowed the last four books from friends or the library as I nearly lost interest around #6. In the final book, Mia has matured significantly. She does worry about things, but not any more than the typical teenage girl. I didn't always agree with the way that she behaved (if I were her, I would have dropped J.P. as soon as I noticed that I didn't feel anything for him) but she stands up for herself and fixes situations on her own, which shows how far she has come since #1. I'm also glad that although the topic of sex comes up in this book, it didn't take up 90% of the storyline as it did in #6 - it was discussed occasionally but in a discreet and mainly mature manner. Maybe I enjoyed this book also because Mia is at the same stage that I am in my life - finishing high school and going on to college - and she said several things which I agreed with, including:
"High school sucks. People who say those were the best years of your life - those people are liars... Who wants the best years of their life to be in *high school*? High school is something *everybody* should be ready to lose." (page 383)
Overall, I am glad that I read all of the Princess Diaries books. Some of them are utterly rubbish, and some are just pure fluff. #10 is definitely the best book in the series, and those of us who started reading these books back at the start of Meg Cabot's fame and still hold a soft spot in our heart for the whiny and obsessive Princess in NYC will appreciate this positive ending to the series.