Hi Alex,
I have already played some user styles, that were created on Solton MS 50 and were converted into the PSR 8000 format (only two variations).
There was one mistake in two styles (of ca. 20), that by Moll (Minor) accords the drums did not played. Probably conversion error. Beside this the styles sounded perfectly and I liked them very much.
As I know, the EMS software does not support the X1 and PSR 9000 styles yet, but in a few weeks a new update should come. I am very curious. I will let you know.
Marek