I recently started my start up and I referred many books before I start. I still read books on marketing and business but this is one of the Best book until date. After reading this book I felt why didn't I got this book at the early days of my start up. Even now it is not late and I started implementing the ideas and tools given in this book. This book really helped me alot and it will help anyone who reads the book. So give it a try for sure.