I have played X1, SD1, SD5 and Midjay. I absolutely love the sound for what I do.
I'm now playing the Midjay with a controller and looking forward to auditioning the Audya.
As AJ said, it's not for everyone, but if you want to sound like a live band, it is the answer.
My experience with the PA800 was exactly opposite of Zuki's. I tried for a couple of months to make it work but was so relieved when I sold it. It's the only keyboard I ever had that my audience commented about how dull and lifeless it sounded. In it's defense, it was the first one to be sold in the U.S. (the rep provided it) and it may have been a dud.
I've always kept some kind of backup no matter what brand I'm using, but so far in close to 30 years of arrangers, in fact since they were invented, I've never had one fail completely.
DonM