My guess is that it is the same acoustic piano sound of the 9000 Pro - the high end is thin and shrill IMHO. But we can let everyone decide for themselves...

I am going to contact Simon and propose a full test comparison of the Tyros, the 9000 Pro stock acoustic piano, and the PLG150-PF expansion card. I'd like to suggest that we do a full note-by-note scale walk-up on a sequencer, first with all of the velocities set at 128 and then one with all the velocities set at something like 90. Then we can each do a short piano-only performance. I can provide samples for the 9000 Pro and the PLG150-PF. I'll see if he'll post the resulting MP3's. Stay tuned.
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Jim Eshleman