I found this book to be sexy, witty, charming and funny. It's an amusing and entertaining read, and gives you a glimpse of a lifestyle you probably know little about.
It's also taken, word for word, from her blog.
I started reading Belle's blog a few years ago and as I quickly got into it, I went back and read every entry from the beginning. This book is taken directly from the blog (minus a few "entries" in the book, and the Being a Call Girl from A to Z dealio at the beginning of each chapter). There is almost no new material, and what is new, is few and far between and not anything earthshattering.
Frankly, I was a little disappointed, being a devoted reader of her blog, to find out the book is just the blog, in hard copy. It for me was not worth what I paid for it, since I'd already read it for free, and can back and read it again, for free, anytime I want. Also, the blog has a lot more content, much of which is not in this book. She posts regularly.
I do recommend reading this book as it's delightful, but you may want to save yourself the $ and just read the blog. I think, personally, you get more out of it (since it's more comprehensive), and it's also current.