the only other one I've ever seen was used by Loverboy's bass player, (Scott Smith)? I always thought it was pretty cool.
I think that's where I first became aware of these as well
I kinda like the single pickup and simpler aesthetic (I seem to have a thing for the late 70s, early 80s basses), and was just curious about their sound and how they compare to the later NS-2s in terms of feel, neck profile, etc.