Oh am I glad I didn't give up on this series! Extras is a fantastic capstone to Westerfeld's Uglies series and in many ways makes up for what I felt was a weak third book.

Extras introduces a new city, new characters, and a new society based on a reputation economy which given what is happening with Facebook, Twitter, and the Internet today, I found it riveting social commentary. The new characters are a little simple but moving away from Youngblood has allowed Westerfeld to explore even more of the world he has created. I felt this might have been even better than the first instalment of his Uglies series, which I think says a lot.

If you were disappointed with Specials, don't pass up Extras. This is the proper ending to the series.