Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Sad mislabeled comic book grade growing guide

Definitely not worth buying. Antiquated and full of myths with few shared facts that aren't already very well know even to newbies. The book is advertised as being by Ed Rosenthal and it is not. The book is really no more then a rehashing of old DWC methodolgies that are known to provide small expensive yields. The methodolgies suggested by the author are known to produce a system wrought with root rot problems. IMHO people would better benefit by simply reading online material from one of the major online growing forums. The hydro nutrient formula advertsied as a lure is no more then a recipe for Hoagland's formula, which is a over 30 year an old tomato nutrient formula widely posted online but never used anymore. Don't waste your money on this book.