It's annoying that these demos always seem to start out or focus heavily on the non-piano sounds. 99% of people looking to buy a stage piano just want to know what the piano sounds like, without any weird layering or bells and whistles. Who buys a digital piano for the upright bass sounds...?
that is not only a stage piano. perhaps it's not properly a stage piano because of his waterfall keyboard, not hammer action. it has a lot of beautiful sounds, strings, mellotrons, church organs and many others whose quality is better than many not cheaper keyboards on the market. i got one and i use to bring it on stage (prog music) while i recently sold a Kronos whose sounds had let me down especially speaking about strings and orchestra. i think kurzweil deserve respect for the quality of his products.