i spent about 2 hours with this instrument on sunday at Fairdeal Music in Birmingham.
As everyone else has said the acoustic pianos are very impressive for a sub £500.00 keyboard. The inbuilt speakers are ok for home use.
I spent time digging into the sequencer and the arranger. The sequencer is not intuitive and casio have not done themselves any favours with their manual in this regard. However i can report that the sequencer is far more detailed than any PSR including the Tyros range.
The organ draw bar is impressive until you start to adjust the drawbars in a live situation and you can hear every discrete increment or decrement in the darwbars instead of a fluid change. The drums are pretty GMish as are most of the internal sounds apat from the acoustic and electric pianos. But the build quality is good and it could be a useful controller keybaord with 76 keys and being so lightweight. All in all a good first arranger instrument if you want to do real piano playing, arranger palying and your own detailed compositions. Next week i will look into the sound editing aspects