At the end of the day it's just a box you stomp on with your dirty boot :)
Here are another two older boxes.
Full freq Rangamaster with high gain CV3007 (mil spec OC44), so it gets dirty from the start. Of course it works great with tube amps, but it gives new life to solid state amps, imo. As it has beautiful high end zing I used to set the amps flat, with just a booster on as my main "eq/preamp".
I am a huge fan of germanium FF, but even well tuned FF might be too much on bass. So I used old clean up trick. The whole FF magic lies in guitar volume knob, but I don't see any bassplayer willing to actually use it. So I put pregain instad of fuzz control (which is fixed at max).
It sounds like this: https://bitchcraftband.bandcamp.com/
My mate used Rick into Hiwatt, with FF in between, to record all basslines.