This is a very good book if you are new to product management or are making a career switch from a non-managerial career to product management. If you have managed one or two product life cyles in the past, you are less likely to benefit from it.
A significant portion of this book is devoted to general management, but in the product management context. Nonetheless, the book is very well organized and systematic. It develops concepts in detail and offers a wealth of information, that you would otherwise have to pay a lot more to collect from other sources. I would highly recommend it to all beginners in this discipline. Experienced individuals may use it as an occassional reference.