One limitation of the PX-350 as far as being a stage piano is that there are only 96 registrations you can have. 24 banks with four buttons. You cannot create a name for the registration.

On my Yamaha PSR-S950, I can name a registration after a song and then look for the song name. With the Casio, you would have to remember that the electric piano setup for a certain song was stored in bank #17 button C.

I mean if you're mostly a pianist who uses a few other voices without transpositions, the Casio PX-350 is great. And I cannot say enough about how much I like the key feel and the concert grand piano voice.

I would hope that the PX-5S has more options as far as storing registrations.