I think, at least for me, the PA3X and PA600 are the first Korg's I can really get behind. Going from 2 fills and a break to four and a break is a quantum leap in making style transitions smoother. I don't know if you can all remember that far back, but the 'jumpiness' of some of the style fills was a major talking point back then. The new Korg's are the first I have heard that don't have that stick out like a sore thumb, at least to my ears.