The PLG 150 is a decent card. I'm not sure about the pianos and Ep's on the S80, but I can tell you the sounds on the PLG 150 are not as good as the standard pianos and EP's found on the S90/Motif. Most people who have heard or own the PLG 150 and a motif/S90 feel this way. There is a thread in the forums at http://www.sninety.com that discusses this as well as the other Plug in cards.

Chris