I've usually avoided organ sounds, just because I've never had a keyboard that can replicate the rotary effects very well. So I've been having fun with my new PA-600, and using organ sounds a lot more.
I still find, however, that the leslie rotary effect is pretty subtle when it switches on compared to the kind of powerful transitions I hear on recordings. I've messed around with the effects settings, but haven't found a way to boost the effect.
If anyone here who uses the Korg PA organ sounds a lot can give any tips on amping up the rotary effects, I would appreciate it.