Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: i lost a whole day reading this!

i must say that there have been maybe three books in my life that were as compelling as to keep me reading them without stoppping. this is one of those. i did welcome the format as a journal. definitely different. and while i personally noted discrepancies with some of the technical aspects, this is an outstanding read. well worth the price.