Took the S910 on stage an hour after I opened the box and loading my files and took my White-Out and marked the Master volume knob notch and rear Vol pod.. I'd say it's 75% a S900...But that other 25% is worth the upgrade alone.

The display is without a doubt 200% better then the S900...viewable at any angle and crisp & clear, Yamaha listened!......graphics are a bit different as is icons & color schemes. I noticed also that on teh top border of the display where on the S900 you had Transpose +/- & Octave +/_ you now have on the S910 the Mp3 playing Time.........and they put the transpose/Octave info in the middle of the screen. The White buttons replaced the Black ones which were hard to see against the black display bezel....now it's easy to see & not make a mistake. Unit feels a pound or two lighter also. Key-feel seems a bit more resistant probably because it's new. But it has the same lightning fast action which I love to play..

All S900 info loaded without a hitch and played great.....I did notice some nice changes in style sounds on teh same styles I used in the S900 regarding the mega voices which is definitely an overall... improvement. I used the same EQ as my S900 and the drums on the S910 sound a bit more punchy as do the styles.

Mp3 player really is nice and plays clear and surprisingly loud. Easy to do a file search off your usb thumb drive also.

I also noticed that the factory OTS sounds are definitely better produced and really compliment the styles...especially the guitars.

Well thats it for now it's late I'll have more to report after I dig into it in the coming days.

Enjoy