I read the book three times. I could hardly breathe each time. It describes detox and rehab perfectly. I am thrilled the book made it to the big screen. Frey wrote the book in a style that is difficult to translate to film. With little punctuation, he gives the reader frantic thoughts, raw feelings, and fractured time. There's a sense of urgency, even pain, throughout the book, just like an addict detoxing in reality. The film does a superb job of telling this story in a way that attempts to capture that edginess for the average person. For me, as someone who knows the reality of all this, I was able to call upon my past to capture that needed grit - it worked very well. If you are newly clean and sober, BEWARE. There are highly graphic trigger scenes at the beginning and towards the end. The cast is awesome. Billy Bob, Juliette, Aaron. Even the guy who plays Ross (?) who bullies him in the toilet. How can anyone fault it? I could not have chosen better myself. Ribisi is incredible. He completely embodies the fear of leaving the safety of rehab. Some of us shook with this fear just as Ribisi's character did. This film is the best it will get for a movie version of an incredible book about the rehab experience. It also has a fairly good soundtrack. (I wish they had left out the dentist scene because we know it's not true and adds nothing to the film.) *Frey does NOT reject the Twelve Steps as some reviewers claim. In fact, he does all 12 steps in the film just as he does in the book. He surrenders, which is the whole freaking point. He even has a sponsor in Leonard and a Higher Power in the Tao. It's all so subtle.