Decided to take the (small) risk and go ahead and buy the guide. I'll try it out and test it, and I'lll report back as soon as I can. I hope this doesn't get saturated easily, because that would be quite a shame if the method doesn't work by the time it's delivered to me!
The exact method does seem likely to be saturated if the initial vouch reviewer's statement is still true; that only about 20 of them exchange hands per day.
Let us know what happens though.