Nicely done Dennis. Sitting at the computer in a quiet room I can hear the artifacts in the vocal track. I don't think it would be as apparent in a live situation.
Of course that still doesn't make it a top performing unit and if you are buying an arranger keyboard just for the harmony, and not for any other features,I guess you could do better.But I think as a total package they all have their strengths and weaknesses.

Thats why they make vanilla and chocolate and 52 different flavors, or whatever it was.

If I remember correctly I think UD said his was done not on a keyboard harmonizer but on a standalone unit.