If memory serves, that's the brown Boss octave pedal, which I have, and like for a limited range of applications.
Cons are:
- Doesn't track that well - you need to play cleanly. Also probably helps to have a compressor before it in the chain
- Can't handle more than one note at once - makes UGLY noises if you feed it more than one note (or if you play messily)
I love it for:
- Long sustained multi-octave textural lines
- Emulating 8string bass when playing in a trio (nice hendrix/King's X fatness and spacefilling
- As with all boss pedals, it's rugged as hell
Steve