I liked the structure of the book (short chapters, each with little snips from the various forms), but the chronology proved confusing at times, as the biographical bits didn't always seem to match up with the journal entries and other excerpts. Overall, while the short book made for a brief diversion (it took me less than an hour to read) I didn't find it left me with very much to take away from it (the ending is completely ambiguous).
Perhaps a slight change in the design (different fonts for the different forms, or slightly varying layouts) would have given a little more oomph to the interesting style.