John,
After four years I'm still finding exciting things about the PA4X. All the modern arrangers are great.
I've had arrangers since they were invented in the 80s and before that organs. I've had at least 14 Yamahas, 5 Korgs, 4 Technics, 7 Rolands, 6 Ketrons and a couple of Casios and loved 'em all! Kinda like women.