Not being able to separate the fuzz and the octave is annoying, true. Also, it briefly cuts the signal when you engage the bypass switch (or at least mine does). The negatives for me end here.
It sounds really great on bass or guitar. The fuzz is massive, and with great low end, the octaver tracks well all the way up to E. Controls are intuitive and work well, also the small switches for dry-tone and the fuzz type work well for guitar or bass (I think up positions are intended for guitars, down - for bass, but you get nice tones if you do not follow this assumption).
It's a great addition to my effect chain despite the setbacks. I do hope that future updates to this effect will fix them.