they are not random Visitors. the guy closest to the camera is a world class well known singer/writer/composer called Frank Mccombe. he did numerous demo for Korg on the M3 , SV1 etc back in the day and is simply a hired gun.
This demo was not his best work for sure and the noise at namm is not a good place to judge anything.
On the stream you saw them arive, play for 15 minutes and move on.. They played mostly the 560 and 5S. But also tried to get some sound out of the arrangers, but they had no clue at all to opperate the arrangers..
On top of that, you just cant judge the sound of an instrument from a NAMM floor demo... I can only tell people to wayt for a studio demo if you want to judge the sound of this under $1000 beast...