A wild, wooly beast
I've been playing through a Dunlop germanium Fuzz Face as my main dirt pedal for the past 6 years or so. Ever since I got my hands on one, I've been hooked. It has helped define the sound of my band. I play a Les Paul with a Pearly Gates in the bridge and a Shaw Humbucker in the neck. The two controls on the Fuzz Face are always dimed and the pedal is on 99% of the time. I use the guitar's controls to achieve a wide range of tones. Back off the volume and it gets super touch sensitive.
It can be finicky with temperature fluctuations and I have one Fuzz Face that has slightly more gain than the other one. Put a buffer in your wah if you want to use it in front of the fuzz. The impedance thing can be a problem with some setups. I've tried the Fulltone 69, the London Fuzz, the mini Fuzz Faces. The big red Dunlop dominates them all. Gritty and smooth at the same time. Heavy as I need it to be and cleans up like nothing else I've used. Depending on the guitar and amp it can be punchy, thick, warm, nasty, biting, complex and more. Lots of character from such a simple circuit. Experimentation will be rewarded. It's cliche, but truly I get compliments on my tone every gig I play with this thing. It has basically become my voice.