You know, UML is like a classical music. * Few people use it. * Even less actually understand it. * There are hundreds of remakes. * You have to be aware of it in the high society.
I needed something to learn UML, and this book does a pretty good job. I had some experience with UML in the past, but I wanted to understand it better so that I could start using it in the future, as most of my exposure was reading existing documents. UML 2.0 in a Nutshell is concise and easy to read, and the perhaps the only major omission is more depth in some of the chapters. After all, it's still a reference book, and despite being a "quick-reference" it could stand to be a bit bigger.
A very straight forward introduction to UML. If you already have worked on a software project of a considerable size you will find it useful and easy to follow this book.
Not a single word in the book has been wasted to delve in anything other than UML. However, this book does not go very deep into UML topics and if you wish to get a deeper knowledge of UML, you should try some other book.