I owned the Moog Subharmonicon a few years ago. This clone was what I was willing to pay for, now that I wanted the rare functionality back in my setup. But no, Behringer didn't hit the mark with this one. The sound is lacking. Week oscillators and a filter that doesn't help much. Speaking of the filter... Behringer calls it a "Multi Mode Filter", but it's not. It's an ordinary lowpass filter with low end cancelling resonance. The sound of the combo is far from "Moogish", at least to my ears.
Now to the firmware. Behringer could of course copy hardware by analysing a Subharmonicon unit. But the software had to be developed in house, since Moog would hardly be so kind as to hand the source code over. The result is a less than perfect firmware. There seems to be a timing problem that sometimes makes a sub hit a different note than expected. And I can't get the fine tuning (a hidden function) working at all. I had no problem with that on the Subharmonicon. There are probably other bugs as well, but I have allready decided to return the unit and not spend more time with it.