In my opinion, the keys on the KORG PA3X have a better feel. More piano like I also can't return the PA3X but I can still return the Audya 5 for a full refund. I have a 30 day money back guarantee. As far as I know. KORG doesn't have a module for the PA3X so I have no choice but to use the KORG as the keyboard and the Audya as the added module if I want both.