The fact that it's freely available online doesn't make it worth reading. If someone is actually recommending it, I'd like to know why they prefer this over, say "The Algorithm Design Manual". Just posting a link tells me nothing. I hope the people that say they're going to try reading this can give a detailed review in a few weeks' time - or even a few hours' - I'd be much more content diving into a chapter of this if I knew someone else thought it worthwhile.
Edit: I see jasim has read it :)