Looking for a Cheap Stage Piano -- Is the Casio or Suzuki Stuff Any Good??

I have seen a Casio PS20 selling for about $700. Does anyone have any experience with them re: durability and sound quality, as compared to something like a Yamaha P120? Also, there is a Suzuki SS-100 that looks almost just like a Yamaha P120S; the case, controls, connectors, and all, with the addition of pitch amd mod wheels. What's that all about?

Hi Doug sorry no one has answered this one as I would like to ask the same question, specifically if a P120 is worth so much more than a PS20.