Update; big thanks to Happy Jack! He loaned me his fishman for a week .(very nice of him to do so, and a top bloke).
Before I took it away, jack gave me a demo. As soon as I heard it , I loved it . He did advise me that the distortion was not much to write home about, (or pretty average). He also advised me that performance varies depending on the type of bass you have.
So, I took it home and used 3 basses with it. The deeper and thud dire the bass, the better the sound.
On my washburn status (which was made passive), it was okay. True, the distortion was fairly light on its own.
When mixed with the octavers, it sounded much better.
Similar on my vester fretless , active bass.
However, on my '77 Telebass it was great. I got lots of studio sounding geezer butler and dug pinnick.
If I had to keep distortion off, then the lower octave is the most fitting for live situations and tight sounding.
With the distortion on , and the lower octave it was best of all. The upper octave sound was a little weak imho.
Prefer it with amp ,instead of studio monitors. Would I get one? Tbh, as I have overdrive /distortion already, I would say no, and would try the digitech bass whammy,which ha been on my mind for sometime.