This book really bummed me out. I loved the Uglies series to pieces with each book being better than the one before. But with Extras I felt it was just that...it was extra. It wasn't needed and it took away from the amazing trilogy instead of adding to it. It was said to be a fourth book in the series, but it really wasn't. Sure Tally, David and Shay made appearances but that was the only connection to the Uglies. I honestly didn't enjoy the main characters, the story or the new people we were introduced to. Tally and David were the only small bit of light in this one. I wish Westerfeld just stopped at the trilogy. It would have been so much better that way.