About: http://webisa.webdatacommons.org/183171069

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	IMO Roland supernatural piano (present in the models you mentioned) is better than Casio px150/350, but sound is a subjective thing, so you may want to listen to other opinions and above all listen yourself.
http://www.w3.org/ns/prov#wasQuotedFrom	pianoworld.com