Two things burn me up about Casio's product line:
The "workstations" don't have a real MIDI out. What gives?
The PX series pianos have excellent voice editing, but not full style creation facilites. So if you really want to write your own styles, you would need to have a WK in addition to a PX.

Finally NEITHER of them have a "Synchro Stop" or a way to turn off arranger memory (in other words, I want the accompaniment tones to cease when I release the keys.) I can't believe they omitted this very important feature, which IIRC was present on the MZ-2000, their last true TOTL model.

It seems like it wouldn't be a big deal to add this through software. We'll see...