I thought it was really, really good.
review taken from Some Novel Ideas
The characters Ness creates in The Knife of Never Letting Go are vivid, sharp, terrifying, and terrified. Todd is a frightened boy whose poignancy is as palpable as his Noise is audible, and Ness manages to make Manchee into the most truthful dog-character I've ever encountered. The preacher/madman Aaron who hunts them is monstrous and wretched. And Ness somehow manages to make the Noise into a sort of character itself, one which reveals and betrays without sentimentality.
Todd's flight is also his journey into manhood, and Ness makes that odyssey at once tense and humorous, epic and human. Through Todd, Ness poses some thoughtful questions about manhood: When does a boy become a man? Are there rites of passage through which a boy must go in order to be considered a man? And what are the characteristics of a man? In addition to the questions about manhood, Ness addresses the idea of privacy and individuality. How can one realize his individuality without the privilege of privacy? What does it mean to be an individual? Can a person really have an individual identity in our world when we have lost so much of what was private to us?