If your scientific education is BBC's Horizon and/or Discovery Channel, with limited maths skills(like me), and you want to know more about string theory, then this is the book for you.
The author explains a really abstract theory (or theories, depending which way you look at it) in a simple and uncomplicated way and satisfied my curiousity with enough imformation. The book does make you think in an abstract way which is a good thing so long as you don't do too much of it in work because your boss might call it daydreaming (unless you're a theoretical physicist)!
Ironically, because Mr. Jones presents a well balanced view of the controversy surrounding string theory, he has stripped away the glitzy, graphically enhanced visuals of my aforementioned TV shows, and now I'm not so sure about the theory as a further understanding of nature. I now see these TV shows as propaganda from scientific/political lobbyists.
I don't think this was the author's intention but I do think the book has done a great job and has given me a more informed opinion on string theory and the confidence to question and debate it.