Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Chock full of very useful formula tips

First, please read the title. This book is about Excel formulas. Please don't buy this book if you are looking for a general guide to Excel. For that purpose, you may want to purchase Mr. Walkenbach's Excel 'Bible'.That said, this book is incredibly useful. If you know a little bit about Excel, this book will take you very far. If you know a lot about Excel, you will be astounded by some of the things you can do using the proper formulas. This book is chock-full of great tips that will radically improve your spreadsheets. The section on financial formulas is particularly well-written with plenty of real-life examples. I have been using Excel for Windows since version 2 (circa 1988). This is the best Excel book I have ever purchased.I unreservedly recommend this book to other Excel users.