Quick-take: This is turning in to a very nice series.
Scarlet is a very nice straight-talking bossy character. Matching her with Cinder was a great choice in the design of the story.
This book is where Marissa Meyer's skill starts to shine. We have to separate threads running, and yet, I had no difficulty following it.
She also does a neat writing trick of switching perspective sometimes, causing what would have been a fairly mundane piece in to very entertaining.
Anybody who is a fan of Book 1 should enjoy Book 2.