so update on this - a few months on, a few conclusions
5 strings: not life changing, not awful. Switching now from 5 back to 4 the "oh this is simpler" is now mixed with "oh there's not the notes where I want them." Glad I am trying it out!
This bass: jury is still out. The instrument itself is amazingly lovely, but not loving either/both the preamp and pickups. I understand why prominent 55-94 player @lowregisterhead had switched them. I find the preamp just a bit annoying. Whereas my two other active bass have a great sound passive and the active lets you tweak that in a nice way this 3 band seems a lot harder to coax nice sounds out of.