Feature:
double sequencer, lyrics, touch screen, everything looks and feel great, the are 3 limitations however, there is no "performance favorites" button, you need to have a paper list for it, there is no USB to device, bye, bye pen drives, and output sound is overall very low, not intended for live musicians, it does come with unbalanced outputs, overall from -10 to -15 db below korg synth normal output levels. This is a great keyboard for home use.

Quality:
So so quality, looks fragile, not appropriate for use "on the road" you better get a hard case for it. everything is plastic, AC adapter connector looks and feels very fragile.

Value:
great value, best arranger under $2000 range. styles are unique, sound like real instruments, wind and guitar sections are great, performances are unique, you can layer up to 4 voices simultaneously, 3 for the right, backing for the left.

Desirability:
sex appeal is good, a good looking unit, if you like blue. special handlers make transporting easy.

Sound:
best sound under 2 grand, sound is expressive as long as you learn how to tweak it, 4 effects unit make this unit stand out, professional features found on this PA500.

Ease of Use:
You need to learn the OPOS OS from korg, however this is a great OS, once you get use to it, it's rolls by itself. learning curve is rather small. you get all the features to modify your sound to your personal taste, so many you will be overwhelmed.

Support:
I haven't tried that yet

Overall:
Not recommended for live musicians, this is intended for the home arranger market.