I've been hyping the FZ-2 for as long as I can remember, I'm pretty sure there's got to be one or two guys here at ilf who are sick of my whining in every single "which superfuzz" thread.
It gets overlooked or looked down on cause it's Boss and not a fancy boutique variant that tries hard to be an FZ-2.
It's the longest lasting pedal on my board, among the cheapist ones, and it's probably the only dirt pedal I'd consider buying again to have two on one single board. Or to put on a seperate bass board, cause it fucking slays on bass.
Anyway, glad to hear you've seen the light. Or heard it or whatever
It doesn't do the hot rodded superfuzz thing or even the FM2/StandardFuzz, but maybe you'll like the Mastotron. Oozes with low end, and it can do some gnarly fuzz factory stuff, only in a thicker and more useable way.
Another one I highly recommend if you're into insanely gainy agressive whooaaaamphffff style fuzzyness and don't wanna limit yourself to octave up vintage inspired pedals: ODB-3. Ironicly enough, it's as far from a "bass overdrive" as possible. And it's even easier to come by and cheaper than the FZ-2. Rips on both guitar and bass, but again, it's NOT for the faint of heart. Not a musical or subtle pedal, but the blend control and eq makes it very useable for a couple different applications imo.