I am a huge fan of Collapse and Guns, Germs, and Steel, and also enjoyed The Third Chimpanzee. Am eagerly awaiting the follow-up to Collapse.
This book is a collection of 7 essays, most of which are quite dry and academic. Definitely not as readable as the books I mentioned above.
Diamond co-wrote the prologue (which is mostly a summary of the book's contents) and afterword. He also authored (alone) one chapter, which is a comparison of Haiti and the Dominican Republic. Specifically, he examines why Haiti and the DR have turned out so differently, despite the fact that they share the same island. Much of this is discussed also in his book Collapse, but the chapter is still very interesting.
Another chapter (by Kirch) compares a few different Polynesian islands, to try and discover which variables led to different political histories. Some areas of the world discussed in other chapters are: West Africa, India, and the western US, among a couple of others. Some of these chapters are more interesting than others. None is probably as readable as Diamond's own.
This is definitely not a light read, and it is not something that most people will read cover to cover. An important book for the academic community perhaps, but not for the average reader (like me). Overall kind of boring.