Hilarious is the word that describes the book. Every bit as funny as his comic strips and the book totally lives up to its title. The ingenuity which author used to describe the most arcane of things is just amazing.
It is fun to read, especially when you have no scientific idea about the thing being described. In fact, knowing the jargon of space and Physics in general actually hampered me, and at times reading in the most layman language I had to think for a minute which scientific object did author really meant.

The thing is, you won't read the entire book in one sitting. I don't think you actually can. Even though it is written in the lamest of language, the science stuff is still heavy. Don't get me wrong. That doesn't mean that the book is dense, quite the opposite. It is just that you don't want to go through all that information in one go. So sit with the book and a friend, every once in a while, choose a topic and laugh your ass off as you encounter the author's brilliance and innovation! :D