Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Fantastic conception, poor execution

The content of this book is wonderful and BCJ are to be commended for their work.The actual book, however, is VERY poorly put together. The binding on every volume I've purchased has started to disintegrate from the moment I've opened the cover. I've purchased and returned several copies because of this (ultimately having to return the book entirely).For this reason, I can barely give it a single star in terms of rating. Had it been bound like every other book I own, it would earn a 5-star rating.