IMO the B-Ninety is a niche bass. If your looking for a bass to parade around as a ‘Fender Killer’ or to demonstrate ‘peavey goodness’, then this isn’t the bass you want. The unique neck profile, if appreciated by the player, can make the bass a personal joyful playing experience. It’s fun to play. A guitar player coming to bass will love it because it’s fast and easy to play, but a chunky neck fender slab bass player who spends all their time below the fifth fret might not like it.
I'm primarily looking for a bass that will suit my style of play, which is rock played with my bare mits. Fender killer is subjective to me because I've played several basses that I preferred over my Fenders. Peavey goodness might be another quirky one because my T series basses couldn't be further apart from the GV and Mills in design theory. As long as it's a quality bass and plays well, I should be able to make it work.
Then again, I'm an 'off the beaten path' kinda guy. Lots of quirky rare birds in my arsenal that probably wouldn't appeal to other players. That works for me!