DocRock came over a while back and let me play through his rig. (One HECK of a rig by the way!!!). One thing that blew my mind was how freaking amazing his Snow White Fuzz sounds at 18V. I'm talking FREAKING AMAZING! Now, I can't NOT play it at 18V. 9V just pales in comparison. Seriously, for those of you who have the Snow White, try it at 18V and get ready for an annointment of fuzz glory upside your head.
Switch up to 18V is like taking the Snow White's engine from a 4-banger to a V8.
As a side note: Doc has a Menatone Working Man's Blue and I have to say, it might be the best value in all the known tone world. Doc can correct me if I'm worng, but I think they go for around $125 or so. It wails. Warren Haynes in a little box.