I'm playing it right now and it's pretty cool and easy to play solo. GMLess! I even think it's almost unnecessary to add specific solo rules. I'll finish my playthrough and then take a look at the supplement. And, of course, it's marvelous, and I'll definitely print it!
All of this is also meant to encourage you to talk about the possibility of playing it as a solo RPG, if you want :)
Ooops! I've just seen the post talking about playing solo! Haha!