Something to consider is that the PA600 has a chord sequencer. This is a really handy tool for beginners and people wanting to work on their RH playing technique...

Lay down ONLY the chords for the song the first time through, hit play on the CS, then practice your soloing and sounds over the backing as it repeats for you. Plus you can still change variations and do fills, etc. while it plays.

Killer feature. Yamaha do not have it.