I have a Reed Geek. A razor blade or a flat bladed knife do as good a job of flattening a reed. The ATG System works as advertised.The ATG system is terrific. It's the most effective and easy to use method of improving bad reeds I've ever seen. You can construct the ATG tools yourself, but the system includes the simple tools, a book and a DVD showing how to use it, and you don't use it like any other method of fixing reeds. I'd say, buy the ATG system instead of trying to figure it out for yourself. You'll save tons of money on reeds.
The ReedGeek is supposed to do several things, and it might very well do everything that is claimed. However, Its most important function is something that the ATG system does NOT do, and that is, to make the reed lie flat on the facing and tight against the rails. Just tonight, I got some chirping from reeds on a very good metal soprano mouthpiece that I know has a perfectly flat table, and I had left my ReedGeek at home -DOH! I had worked on at least one of the chirping reeds with the ATG system, and it worked OK with a tight 2 screw ligature. The ligature of the metal mouthpiece held the reed very lightly, and I kept getting chirps. The ReedGeek is very good at solving this problem.