DNJ,
Actually you have understated the fill-in capacity of the PSR9000. In each style, there are fills up and down between each variation, and also fill to the same variation. They are all different, plus the break, 3 intros and 3 endings. All of these are user-programmable in style edit mode and, as you said, can be incorporated into live style play. Also you can sync the multipads to the style playing.
I wish Yamaha would let you store new or edited styles into any of the factory locations as Korg does.
DonM