Just finished it. Very good, but a distinct departure from his other books. All Chuck's other books have a similar theme. "To be free/grow you must do that which you are most afraid of." Diary is more of a "Why do bad things happen to me?" and an attempt a fighting fate kind of story. Which is refreshing. I was afraid the the diary/journal style of writing in the book would be a difficult style to accept, but Chuck does a good job of starting out journalistically and slowly lessening the diary aspect of it and blending in a more standard narrative. Which makes it all the more impactful when he reminds you this is suppose to be a diary.
All in all, not as impressive as IM, my favorite, but very good ideas in this. It's akin to Lullaby for reasons I'll not tell.