I bought this book several years ago. I still have not finished reading this. I bought it thinking that it may give me a brief introduction to the subject of metaphysics. However, it really is a book for the professional philosopher or an undergraduate (or even a post-graduate) studying philosophy. In short I find the book rather difficult.
Saying all this, I did enjoy reading the chapters "Causation", "What do we refer to when we say 'I'", and "Personal Identity". These are very interesting but are also written in a rather pedantic way.
I am a practising physician, so perhaps I am a bit biased in my opinion. I think a lot of the topics covered in this book are probably equally well dealt with by studying human psychology. In any case, this is not an easy book and that may be the reason I am the first person to write a review even though it was published nearly ten years ago.