I'm pretty impressed by whoever is doing the playing on the BK-9 demo series that is labeled 'Famous musicians tested Roland BK-9'. The poster doesn't name them (it is a few different people), but they all have chops. And some of the jazz guitar emulation is some of the best I have ever heard.
Robert isn't playing in arranger mode at all in that Canadian broadcast, he's playing to either a sequence or an MP3. Not that that doesn't count as an OMB, but on an arranger forum, it's nice to see people playing LIVE in arranger mode and not sounding like amateurs!