Just wanted to give some feedback about the Casio CT-S1 as I just played a beach gig with with. First impressions is that the piano sound is a winner overall, and the electric pianos come second; the thing that sticks out is that the definiton of each note is quite good. Chord playing is great, comping is easy.
As a side note, I did feel that some of the bass was a little on the heavy side on the piano sounds, but it might be also due to amplification and the acoustics.
Overall feeling is that I can gig with it!