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Not yet, heard of one R+M packster or load been retrofitted with this after they gave up with constantly wearing out/explosion of envilio.
Higher end, yes I mean that customers think a nice I9 clicky hub is what you want, but in reality you can barely get the larger gauge cargo/sapim e strong spokes through the holes (or tolerance isn't ideal so its gonna be an issue), flanges aren't strong enough, hell barrel of the hub probably isn't enough. Same issue for Tandems, so many running around on normal hubs then come a croppa due to over load/torsion/time. Same for tyres, often see folk swap out stock burly tyres for some nice tan walls. Great until you ride 2 miles with only 50 psi in them and sidewalls get shredded.
Have you had any customers with some serious field use of Kindernay and mid drive + cargo?