To me they are a let down, medicore at best even when compared to Yamaha... Most arrangements are kind of dull.

The strongest points of the MZX are the midi phrases you can trigger from the pads on top of a styles...

The only reason i can think of why adding support for Casio styles would be a good thingis to make the Varranger an even more complete unit. However i think i could name dozens more important features to spend development time on then Casio style support.