Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A necessary companion piece.

If The Simpsons Forever! isn't crammed as full of information as its predecessor, A Complete Guide to Our Favorite Family, it remains a must-have book for any fan of The Simpsons. The Simpsons Forever! picks up where that book left off, covering the ninth and tenth seasons of the show, as well as filling in a few holes that surprisingly did exist in the first book. It really is helpful only if you own the first book as well--though the style is essentially identical, and the book is of incredibly high quality, this book isn't the exhaustive compilation of Simpsons information that the first one was. If you already own the first book, you need to own this one as well. If you don't, you should still buy this one, but buy the other first.