Hi Sam,
My setup is incredibly simple, Giffin Custom guitar into SF-2, into mid-seventies Fender Pro-Reverb or Zvex Nano amp. I might throw in the occasional stompbox (fuzzes, Zvex seek wah, looper, etc.), but most of the time it is just Guitar, SF-2, and amp. As far as the tone, if you have never played around with an SF-2, then you are really missing out. I like to run it with one channel set for low pass, and the second set for High pass. I dial in a good low thump with the low pass, and then add sparkle to the sound with the high pass. These are blended with the bypass to form the final tone. The best thing about the SF-2 is how a small and subtle change in the settings can change the sound from being quacky, to muddy, to crystalline. It is the sort of effect that provides instant gratification, but which also allows for greater development and understanding over time. My ears have improved since I first bought mine. Someone once said that I wouldn't fully appreciate the adjustable Q for some time, and they were correct. I could go on and on about it, but I think you probably get the idea. Unfortunately, I don't have any good sound clips. I haven't played out since I bought mine a couple of years ago, and my recording equipment is currently in storage, as we are trying to sell our house at the moment. I occasionally see them pop up used on Ebay, usually in the range of about $500-$600, and while that isn't exactly cheap, the unit easily destroys any EQ I ever played with, and is just generally one of the most musical sounding ways of processing guitar I have ever come across. I know there are some other folks using them for guitar on here. Maybe someone has some clips.
