Cons - Poor tracking and distortion with hot pick-ups.
This pedal did not work for me. My pick-ups are hot Dimarzio Pbass pick-ups that made the pedal distort and track poorly. I will stick with my DOD Octoplus that sounds and tracks much better with my bass.
Maybe it's because it was the first, but this is the tone that you think of when you think "bass octave pedal". Used by Tony Levin on "So" and by Pino Palladino with fretless, this pedal's tone is locked into history as "the tone". Downsides? You have to watch you're playing technique because it will glitch. But the tone is so good that you live with the potential for glitches and just enjoy the sub octave beauty.