I learned about this product on the Song of Blades and Heroes forum. Then I looked for reviews and found so much praise, that I had to check it out. Turns out that it really works for playing RPGs solo; I've just tried it last night with good results -- an interesting story with a couple surprises.
The mechanics of the "emulator" are actually very simple to learn, but I have to wonder how much playtesting was necessary to build them -- as well as the tables (which are few, and ingenious). I mean, there's so much interesting output from them, that it's not like a bunch of random roll tables. The text is clear and well-written, and there are lots of examples.
Even though I still have to try using the emulator for GM-less play with more people, I consider that this title was well worth its price.
[5 of 5 Stars!]