This book covers a wide range of negotiation topics. It is a soup to nuts book of negotiation. Depending on your skill level and needs, some information will be new, and you will wish that other topics had more depth.
At times, I found the book verbose. By that, some things were obvious or trivial.
I read the Kindle version of the book using my iPad. I wish many of the graphics were better. Rather than having tables and such as a graphic, I wish the information had been presented in a cleaner format. And some of the colors made highlighting challenging.
Overall, it is a good book because it provides an excellent overview of negotiation. You can find other sources to strengthen whatever areas you wish.