Speaking about the opinionated piano sounds..I would venture to say the vast majority[of piano players], in a blind test would select the Roland 700sx piano over all the competition..

Someone posted a piano shootout a month or so ago..It was extensive and really brought to light the way the pianos sound when played with dynamics.

On the Casio piano comments..I take the Casio over the PSR and DGX models, for tone and dynamics...It isn't close to great, but neither is the Yamaha.