You are correct, @dkfynn, that you MUST state if you have received a product or money for the review you have published. These are FTC guidelines which you could be fined for if you don't follow them. I do know that some bloggers won't write anything negative, or will tell the company they will not publish a review if they have to be negative. I tend to review it anyway, if it's a product, but I can see where you are coming from with it being a book that an author spend lots of time on.