Donny, Since you asked I'll write my thoughts. I know plenty has already been written already but for me here's what I love about it.

1. Touch screen
2. Better Keybed
3. The operating system mimics Genos
4. Playlist feature for me when this was released on the Genos it was the proverbial "goose that laid the golden egg." Makes using the sx900 live much easier than it was with the s970.
5. Improved speaker system, I can really see myself using the speakers only in a small gig situation.
6.The ability and ease of just like on Genos to go in and tweak instruments a little differently.
7. Many of my Genos and former PSR s970 registrations work some need tweaking.
8. It's much easier to access midi file and mp3 file play verus the old PSR series.

The only downside and it's not a deal breaker:
I wish they had kept a "Country" category for styles, just not sure what they were thinking when they put a few of them in the "World Category" and some in the "PopRock" category.

I'm really happy with the purchase.