The "bread and butter" sounds can be a bit lacking on the PX5S eg., guitars and brass IMO......but it is nice for other sounds outside of standard piano.......
  LISTEN HERE and   
HERE (6 different demos here - all nice apart from the nylon guitar IMO) 
PS: John, good luck with your purchase - surprised you didn't like the key feel of the PX5S.  But I'm sure you're very happy with your purchase.
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Also, as above, I too would love to see Casio really shake the likes of Yamaha up and get in on the TOTL arranger market.  I think they could do it and while they have had some lovely boards out the PX5S really seems to have resonated with buyers and the phrase I have used is "they're doing a Skoda"!!.  Interesting times ahead.