I do not know this guy, and not saying he's good or bad, but I would spend your dough a better way. It maybe a little more, but Will Dunniway's guide or France and Scully Osterman's guide starts at $35. They have been around a long time, and teach regularly. Then there is John Coffer's dvd and manual for $100 again, a master who has been at this a long time. Also Quinn Jacobson has some newer manuals out now, available in two volumes. one for making positives on glass and tin ($60) and one on glass negs and making prints for ($45) and access to videos as well. So this space is fairly well taken care of. That said, it's up to you. With the $25 offer, you only get a .pdf file, whereas the others, a real book!