Ooo.. that's a tough question, I can't quite answer yet I need to use the SX900 a little more. First impressions I would say possibly. If I wanted to save room and have an almost exact replica in a portable unit (not needing all that speaker system stuff), then that would be a big benefit for me as I don't have much room.

However, would I miss the SA2 voices, keybed feel, storage, maybe even video out? Maybe...