I heard that the fill-ins on the KORGS to transition is not so good compared to Yamahas. This would be a major problem since you use that feature a lot.

I don't own PA1X but I do not have problems with any of the Yams I owned in the past including my currect PSR3000.

Maybe you can buy from the places that has 30 day money back. You don't know these things until you tried it out extensively for a week. In the past, I changed kybd several times with the moneyback without settling on my final choice. I discovered lots of regrets on my previous choices. Thank god for 30 days moneyback.