This is a Yamaha S90, it's not an arranger but maybe someone can compare the piano sounds here with the "shootouts" someone did a few weeks ago.
http://purgatorycreek.com/mp3/Yamaha%20S90-S700.mp3 http://purgatorycreek.com/mp3/Yamaha%20S90-NatGrand.mp3


Any comment? Thanks!
..rb