The book is pretty much what the title says. Don't expect the book to have in-depth coverage of careers included in the book. Note that numerical facts in the book will lose relevance as the book ages. Most outlook of the book goes up to 2014.
The book is best suited for people who wants to know what is out there. Anyone who needs in-depth coverage of a certain career will need some other reference materials. Most of the materials in the book can be obtained through internet research, but it saves a lot of time to have all the information in one source.