I could never go with anything but a touch screen again, and the SX-900 has a fantastic one. I'm so use to it, I recently played a friends S950 and found myself tapping the display.

I also like the chord looper, and I'm still in the "messing around" stage, but I can see the possibilities.

Finally three right hand voices with more DSP'S, and a nice onboard speaker system all make the SX-900 a much nicer keyboard from previous PSR's