I've tried Boss OCs, Sub 'n' Ups, Whammys – nothing touches the POG for tracking or quality of life features. I'm a working musician, and this is a desert island pedal for me. It lives on the gigging board full-time, and I don't think I'll ever get rid of it.
The tracking is absolutely FLAWLESS. You can't make it struggle. It'll easily handle anything down to A on a bass guitar on the sub octave. Below that, it still works, you just can't audibly make out any note that low. But you sure do feel it...
With octave up on bass, it's open season; whatever you throw at it, it will track.
On guitars, it's a monster. Handles chords/double stops really well, but shines on fattening single note lines. The octave up is glassy, and while it lacks the charming, glitchy character of a Whammy, it is far more useable.
The dry signal out isn't celebrated enough; because while you can obviously blend in the dry to the effect out, this little signal splitter gives you a gateway into parallel processing – and for bass at least, this is a killer feature! The super low octave can cause your amp/preamp to get saturated and gnarly – but split the low octave out to a clean signal, separate from your dry signal, and you've got magically full low end, and dry signal cut-through.
It's also fun to experiment with novel signal paths with the high octave, too – using it as a guitar sim into a guitar amp/modeller.
Cannot recommend it highly enough.