My experience:
Bought one twice and sold them. First one worked great but had an output problem so I was sent a newer one. I think mine was one of the first models because the filter sounded better calibrated on the newer one.
As far as modern day mono’s the minibrute sounds really good both from the oscillator and filter section, would have kept it but I much prefer a 24db filter. You have to want that aggressive sound, that being said if you do its great, especially with the arp, for fx, or its pretty good on bass.
Comparing it to the BS2; the BS2 osicllators sound flat in comparison and the filter is less alive, though I like the actual character of the BS2 saw oscillator, it can sound quite vintage, especially running the arpeggio. The minibrute sounds analog, the BS2 not so much. Both sound warmer than the analog four. If you just want bass and a modern synth the minitaur is better than those three.