I played a version 3.0 PA80 yesterday, and there are some nice improvements over the beta release. It is still, a little clumsy to use in a live situation compared to the MUCH easier O/S of the psr2000. There are some features on each that shine, but the Korg is just not as ergonomic in a live setting as the Yamaha.
EG:
1)fill in buttons are accesed by the SAME button as the variation you choose(psr)
2)acc buttons are all very close to the left hand(psr)
3)mic harmony presets are more musical and easily edited(psr)
4)multi-pads can be freely programmed to include many arranger-like features. This is limited on the Korg, I believe - wasn't even offered on the first release. Anyone clear this one up?
5)drum patterns and fills are more logical, and match each others energy level better
Now for the Korg:
1)Much better feel. Keys are more solid
2)drums are more real sounding, but often TOO busy
3)dual sequencer adds versitility for smf playback
4)stereo inputs to the sound system (onmy mono on the Yamaha)