I have a few favorites but the single best feature I think is the improved MFD feature. It's great for live play. It's simple to use and it easily saves either on board styles or those on a USB drive to the database. It will also save both midi files and mp3/wav files too. Once you save a style, midi or mp3/wav file they are very clearly marked in MFD.

I also like the improved TFT color screen viewable from any angle, the reworked styles and SA2 sounds. Good luck and enjoy your new s910.