I’m not impressed with the video either, and audio demos on Korg’s site are even more questionable, but it’s hard to say whether it’s a bad demo or a bad instrument. I used to be a faithful Yamaha’s believer, and still think that Yamaha is rather ahead in the competition (it’s also backed with sales reports), but now I tend to think that one instrument can’t cover all the needs and if you deal with music a lot you may benefit from having different tools for different needs. While 64 voices polyphony is not enough for piano playing, when it comes to other sounds you usually don’t need that much. And as an addition to digital piano this machine might be rather suitable. So far this is the only lightweight keyboard on the market without speakers with an arranger feature.