I recommend this book to anyone who wants to improve his/her excel proficiency. It contains 101 very useful formals simply explained and every chapter comes with an excel file that you can practically apply the formulas as you read.
If you're an Excel nerd who builds financial and operational models, this is a must-read. It's exceptional. Well written with very few typeset issues or errors. The information is easy-to-follow and offers great ready-made formulas that you'll absolutely use and learn quickly. Great book in all respects, for us nerdy folks, anyway.