This book really gave me food for thought. I've always thought about a user's interaction with a device in terms of its interface (buttons, GUI, etc.). This book opened my eyes to the fact that it's not just the interface, but the user's entire experience with the device that matters. Anyone who has a hand in designing or making something that must be interacted with should learn about this.
There are chapters on things like "Applianceness", "Scales of Experience", and "Information Shadows". Each one discusses an important design consideration, and how it relates to user experience. Some of the chapters are more like case studies: the development of a specific product (like the iPod) is discussed, with a focus on how its overall user experience was designed. I found them interesting and enlightening. It's fascinating to read about some of the products. As the author points out, some devices are easy to use but not useful. Other devices, like the iPod coupled with iTunes, provide a good overall experience and do well. Still others, while they may have a solid design and reasoning behind them, do not do well in the marketplace.
The author references many sources in the book, so if you want to do any additional reading on the subject you shouldn't have any difficulty in assembling a reading list. The author chooses to cite his sources inline using (author and year), as opposed to a number like [42]. Unfortunately, placing a reference citation inline is disruptive, and because he uses the longer citation format it got annoying at times.
I think that if you need (or want) to learn about user interface/experience design principles, this book will be an informative read.