I have two: a Mercier and a SOMA, named for a neighborhood in San Francisco, where I ride. Every day. In the densest, most-bike-populated sections (SOMA, Financial district, Hayes Valley). And yet I have never, ever seen another minivelo on the streets.
I saw one in a shop once, the same shop where I got my SOMA by special order. It was another SOMA and eventually it was gone. But never on the street.
Funny thing is, I get asked about the bike all the time. The reactions are almost universally positive* and people ask me where to get such things.
Someday.... what about your town?
( * The only people who object: grey-haired candybar-lycra dudes. Seriously, they act offended at my bikes' existence. Carbon fiber poisoning, I guess)