I did not see this posting before I made mine regarding this keyboard. I too am interested in information.

I have a 740 and just recently acquired this DGX 500. I have quiet a few files, styles and songs that I have made or downloaded from the net. The ones I have tried on the DGX that I am using on the 740 hve worked as far as I can tell without a problem except that on the 740 there are 4 style variations and the DGX 500 only has 2. That causes some variations. It is mostly Simon's styles that I have used. I have had this keyboard only for a couple weeks so am still far from checking it out.

Sure is nice to have 88 notes, and all things considered it has a nice feel.

bvan