Okay, I tried the ManyTone Upright, and (at least with the default settings) it was a little too... interesting?
Being MIDI-driven, it wasn't as busy and buzzy as the RealTracks uprights I've tried so far, nor did it have the intonation issues (sorry guys, but some of those RealTracks upright notes make me wince), but still, the ManyTone was just a little too present and noticeable for my taste.
The bite would probably work well for more "aggressive" jazz or rockabilly or something, but much of the time, I'm looking for that smooth jazz trio or cocktail lounge sound.
I could change my mind after playing with the ManyTone bass for a while, but for now, I still like the way the VI.ONE upright sound just lays in the pocket.