Had the PA 600 for a quite a while and now have the PSR-970.
Korg: Still struggles with out of sync left hand chord triggering.
Electric pianos still based on Fender Rhodes...boring.
Korg...time to get rid of the trash can toms!
Electric guitars, especially in left hand styles are not realistic.
Right hand sounds are OK.
Yamaha: Chord triggering is right on. Electric and Midi Pianos are superb. Electric guitars in both left hand styles and right hand solo work are extremely believable. With the addition of new Live Drums and new midi drums, I no longer have to replace drums with computer VST's. Overall I am blown away by the 970. No wonder dealers are having a hard time keeping them in stock. I've also had good luck with VH-2 harmonizer. The addition of the arpeggiator adds the ability to create some nice contemporary styles as well.

Jingleman