Hmmm,

George I think 1.100 USD is awfully lot's of money for keybed upgrade, piano sample and funny looking speakers, especially when You consider that entire Pa500 arranger (with lots of samples other then piano, styles, etc.) cost 1.500 USD. But sure is attractive for anyone who wants powerful arranger and 88 keys.

Yamaha have something similar from couple months ago, MM8 88-keys version of MM6 the mixture of arranger and synth. Not as powerful as Pa588 in the arranger department, but surely much more affordable (it costs almost the same as the price difference between pa588 and Pa500).