I wish there were more fill-ins per style; just one basic-to-variation and anotherone variation-to-basic isn't enough; I don't think it would be so difficult to program half a dozen fills per style (the drum parts could even be shared by different styles of the same family); it would be nice if you could assign to every fill a "probability" value, just like Band in a Box does, so every time you press the "fill" button you would be sure that the fill is chosen among those you like most.
(Boy, am I bright!)