I finally got my S80 the other day. This is a keyboard players instrument. A great feeling keyboard with aftertouch and Lot's of controller inputs and sliders. Some people say the display is small, but I think it is more comprehensive than a larger screen with more distractions. I find the pianos to be very expressive. The synth engine is powered with resonant multimode filters. Since the general concept of the S80 has been around for years, it benefits from all the other attempts.
If piano/keyboard wasn't your primary instrument and you were looking for something to compose with, I would probably recommend something else.
I didn't the plugin boards, did I?
Bill Mocarsky