Re: My name is Curly, and I admit I like FUZZ ... as in Wattson
OK ... a little follow up ...
I've recently built two kits -- the BYOC Leeds fuzz -- their version of the Univox/ Shin-ei SuperFuzz, and a General Guitar Gadgets Companion Fuzz, based on the Shin-ei Companion fuzz -- a different circuit, but shares the fat, scooped bottom end, and long sustain, without the octave effect. I have to say both could use a little tweaking, pretty usual for my kit builds -- they are both totally OK to use, but the Companion is pretty bassy, and the Leeds gets a bit mushy. Both have long sustain though, and they're a lot of fun.
The orange one is the Companion, Leeds is blue ....



I'm also getting a Quinnamps Prophet, aka Mantis:
note that's a bass clip ... one person said, "One side is like having sex, the other is like having your head eaten!"
and here is another SF version from Brad Davis of Fu Manchu (known as Creepy Fingers Effects):
a tweaked version that turned the 2-way switch into a blend knob -- actually pretty practical
I don't think you can go wrong with the Black Cat -- Analog Man sells those too. I was in a local studio yesterday, and they had a Black Cat Superfuzz in the main room...
I've listened to several clips of clones, and they vary a lot, so my comment is that the circuit is a little complex, and it's not enough to just throw some parts in a box ... the good builders have spent time dialing in their pedals, and you can tell the difference.