Just back from a test drive on a NX450H + .Very impressed by the quietness, the smooth ride, steering, road holding and sound system (not ML) .
Very responsive acceleration especially in sport mode, a bit of a roar under hard acceleration but why not? Completely silent in electric mode, even wipers are completely silent. Seats a bit uncomfortable (sport version) and back visibility not too good but there is a back camera and various warnings.
I was told that towards the end of the year there will be an update over the air for wireless android auto. Generally more than pleased having ordered it without trying first, delivery confirmed for second half of March (ordered mid September) and looking forward to that!