The keyboards came in a couple of days ago. The sounds and styles are very similar to the higher end arranger products from Yamaha. An increase in polyphony from 32 to 64, the ability to make your own user styles and 16 track songs and a very simple method of muting tracks either in style mode or song mode is very nice. There is now the ability to have the guitar tracks within the style play with proper guitar chording voicing like the 910 and tyros4. It's layout is basically the same as the PSR-S550 but with the addition of being able to load 16MB yamaha supplied packages via USB drives. I loaded up a usb drive with styles and midifiles and the nice thing is how quick you can call one up and play it. With a lyrics and score feature I wish the screen were bigger. I have not seen or heard any of these except through the internet and I'm really anxious to demo these myself. I wish Yamaha would have added seperate outputs rather than keep the headphone/output single 1/4" stereo plug on the back. It can't be that big of a deal to give you outputs on a $800.00 keyboard.