I think Spencer should just ditch the sub switch on the Mkiii but I’m sure a lot of people love that addition. Plenty of options out there anyways.
For me, the sub switch was the sole reason I considered the Octabvre.
Does it sound better than the others on its own? Maybe, but a $150+ better than the second most expensive option? You can get two octave pedals for the price of a single Octabvre! How about in a mix? Doubt anyone could tell the difference between any of them (OC-2, OC-5, Octabvre, Broughton, MXR).
What else does it have going for it? Built quality? I'm sure the Broughton is as well-built, and people are still using 50-year-old MXR and Boss pedals. Also, let's not forget the fiasco with the print on the first batch MKIIIs and how long it took him to address it.
But the sub switch would've been nice. Then again, having to bend over to change one knob isn't the end of the world. I just wish more pedals had one.