The content of the book came from his essays (posted on his website).

Whether it is worth or not, it depends on how you define worth.

I used to buy the hype cycle out of recommended books by "the internet" (reddit, HN, blogs, etc), for example: the tipping point, wisdom of the crowd, paradox of less, this book, get things done, etc.

But then I figured out that I want to (and should) do my own thing, not to follow someone else's lead.

I sold mine last month and am now trying to get rid the other books as well.

Keep in mind that while it is 6 years old, most of the content are "concepts" of various topics from startups, competition, hackers/recruiting, etc.