Ah, it was delivered yesterday.
I have to say, it sounds like a Muff, but it's gain character is somewhere inbetween the Green Russian and Op-amp, logically, since it's built around dual op-amps.
The blend-knob definitely is a step up from the toggle switch on the original.
It doesn't sound like 2 different signals next to eachother like with the original BBM, but more homogenous.
The tone knob below noon is absolutely useless though, as it has quite a dark sound in itself, and the bass boost switch, nice idea, but a bit redundant in my opinion, perhaps it's more useful for guitarists
Still, it has a few sweet spots, and works pretty well with a mild drive in front of it.
Real estate wise, it's smaller than the original BBM, and overall, it's tonal character has more mids than other BM pedals, something it shares with the Op-amp muff with the tone deactivated.
Using the blend-knob to carefully mix clean and fuzz, many outcomes are possible, and even convincing mild OD sounds are possible when playing around with the sustain and blend knobs.
With the blend fully clockwise, the sustain and tone around 3 o' clock, it does sound like my Green Russian reissue, but with a little more mids/definition.
I have some mixed feelings, but am mostly positive, so, I'd say, I'd give it a 7,5 out of 10 points.