His books are mainly a lot of info gathered todether in one place. Most of it is available elsewhere but you would spend many, many hours finding it all. You may only find a couple tidbits that apply to you but they can be worth more than the price of a book. You can find other books like his at your local bookstore also. You can usually find his books used at a very large discount on ebay.
To me this type of thing can be worth the money just as a time saver. Just on a side note I know a person who used to be his partner in a couple ventures, they made very good money but the Kevin is about Kevin. Not saying that is good or bad just felt it is worth keeping in mind.