The Subharmonicon is by far my fav of all the semi modular Moogs (I've had em all!) and IMHO the Subharmonicon is an example of the parts being greater than their sum.
You get 6 oscilators (yeah, I know they are grouped in groups of three and are limited)
4 clock dividers that can be assigned to one of two (or both) 4 step sequencers
2 Attack/Decay envelopes
and a pretty sweet Moog filter
couple all of that with THE BEST patchbay of all 5 Moog semi-modulars and with only a handful of auxillary modules, you can have one heckuva crazy synth.
I sequence Vco 1 and 2 seperatley and don't use the internal sequencers for them at all. Those are for the decay of my Qu-Bit surface and ALM mco mk2 respectively. The sequencer clock outputs each triggera pair of funtion generators that modulat other stuff down the modulation pipeline so with the turn of a few knobs, I can get some wild modulation. All in time as well.
Also, all 3 OSCs of vco2 are routed to a seperate vca/filter with a Phase Modulation oscillator helper type thing in there for aadded FATNESS (lolz)
TL;dr
if you are thinking about getting one, do it. It's the best one