I tried learning UML by using the more popular books, but had difficuly absorbing the information mainly due to time constraints. That's why I absolutely love this book - very short, great chapter layouts and plenty of examples. In fact, the examples serve excellently as a quick reference when I need to figure out how to model something. The disclaimer is that my job does not require super-professional and perfect design documents, and if you're in a similar situation I would strongly recommend this book.