I read the samples it and seems decent... although heavily spaced with large nicely formatted quotes. I feel like I'd blow through the whole 83 pages on a lunch break. But of course, this might be a good thing... often times the best advice is succinct.
I'm on the verge of buying it, but I probably won't for two reasons. One: many VC's and entrepreneurs have done such a great job at disseminating this information that it's basically free. I don't mind having to do some digging around to put the bits together.
Two: I want to help out. If I save my $20 for myself to continue working on my hack, then at some point I can pitch to these guys and eventually make them more than $20 richer... so it really is to their own benefit.