Roel,
if you are talking of the audio/video quality, then the credit goes to Yamaha, that organized everything. On the other hand, if you are talking of musical proficiency (chops and good taste), then I have to say that, while I greatly admire and respect Baartmans, Voncken is not in the same league (not even simply talking of chops). And even Baartmans in this demo is following more or less the same script that Martin Harris wrote with the original T3 demo: same sounds, same styles, played in the same order... like he was afraid to be too original or was just told to do so.
On the other hand it's true that Harris is the father of the Tyros 3, so noboby knows the instrument like him, but I think that Baartmans gives his best when he demoes the Clavinovas.