AJ,

Actually I have SD-1 and 9000Pro, and both keyboards are fantastic.

In my opinion, the best world keyboard is the one I can afford for it, but:

-in SD-1 you navigate with compass, in the 9000Pro with GPS.
-The screen letters and SD-1´s buttons are very small. Lay-out could be improved to make it easy to locate the functios more quickly.
-SD-1´s polyphony restricts some combinations with a lot of timbres.
-The SD-1´s keyboard mechanism is less precise and noiser than the 9000Pro.
-The functions that require hard drive use are easier and fast in SD-1.
-The function aftertouch is more programmable in SD-1.

I enjoy both. (Untill Ferrari has their problems)

Armando