Well, I hadn't had a Yamaha since the S900, but the drums, piano, guitars and vocal harmonizer are much improved over it and it would have been worth it to change from that.
Can't say I would trade up from a 910 though because I never played one.
Pity they just teased us with the audio styles. I only use two of them sometimes, the Big Band and the Swing. If they would make a customizable pack with several of the styles of our choice it could be made into a valuable resource. I wouldn't hold my breath waiting for that though!
DonM