Hi, im quite shocked at seeing such negative comments about this book, i picked up a copy and read it from front to back to further ingrain my own knowledge of Bootstrap, This book has almost become obsolete now as bootstrap has moved onto version 3, although some of the books content is still valid, and does help you with many good source code examples, Bootstrap is taking the web development market by storm, lets not forget this book is under £13 for the paperback version, and not everyone enjoys reading online but if its your bag its less than £7. Personally i enjoyed it, but having written sites in the newer bootstrap 3 version, i could easily adjust the examples in the book to work with this later version. If you really dont know why or if you should use bootstrap, then to be honest, its not for you anyway. For the rest of us, who are serious about web design we know bootstrap is the way to go!
Looking forward to a Bootstrap 3 book coming soon :)