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The keys are much nicer than the 900. They feel like they will not loosen up over the long haul (much improved over the PA50 I had).

They are 5 1/2" long.

The OS is different for me. I think it is easy enough for live play.The touch screen is nice to work with. The button layouts are good. I'm just not convince that it will allow me to play my medleys that are so fluid on the 900.

I like a lot of things about it and I'm not giving up yet.

zuki