This book is based on the success of the authors' past predictions, so its value depends on their current predictions. Predictions in the stock market are not all that reliable. Just look at the records of people over the past decade or two. Some stars have fallen in disgrace and other unknowns have risen to take there place. So, just who do you trust enough to follow?
I would recommend reading books that Inform and instruct you how to break that prediction approach and instead follow what works over the long-run. That is the Boglehead approach. You can find a collection of quotes that give a taste of various books using this philospophy in Taylor Larimore's Investment Gems