I've never seen anyone riding Uno.
I never seen anyone rode Di2 the first year it came out.
I doubt Rotor's groupset(s) will ever be as popular as Shimano's Di2 though, or even SRAM's eTap for that matter.
There was plenty of Di2 in the pro peleton.
I actually google Uno groupset a couple of months ago wondering what happened to it. Was sure they didn't develop it as it wasn't available on the market. Huge surprise - they did. Pricing was a surprise as well.
@edscoble started
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I've never seen anyone riding Uno.