I just had a chance to read Scott’s post and would like to add my thoughts to the mix.
As I mentioned in my earlier post it was interesting to me to see how others use their keyboards. Scott performance was confined to a piano bar style. All his songs were piano oriented and his songs included vocals. Because of this he didn't use a wide variety of instruments. While he did use some instruments besides piano it's understandable that the piano sound was the focus of his performance. 
As to a fair trial of the system we had two problems. The first I don't think we used the available time to really explore the options, and second my lack of familiarity with the new system.  The room where Scott performed was very poor acoustically having hard floors, walls, and very little to keep sounds from bouncing all around. The group  was very small so it didn't have the sound absorbing qualities of a large group.   Although this was an organ club meeting no organ music was played. 
Due to the poor acoustics of the room and his set up Scott found it necessary to make system adjustments before his second set  to make his vocals intelligible. In my judgment it was definitely not an ideal performance setting in which to make meaningful comparisons.
Subsequent to our trial I learned more about the PAS presets and found that we never tried the "flat' reference setting. Had we done so we might have had more success. 
Thanks to posts by other SynthZone members much additional information is becoming available on the PAS system. I've collected some of it and will forward my limited findings to anyone interested.
While much is made of the stereo aspect of a performance expecting a piano to sound better in stereo is much like expecting Luciano Pavorotti to sound better in stereo. In both cases the quality of the sound is dependent on the quality of the instrument.
To summarize my view of what Scott posted as a comparative review of two different systems I would say the following. 
The only one who can determine whether a particular system is right for you, is you. Try the various systems to see what works best for you. The system you'll select should be based on your ear, your style of playing, your expectations, and your application. Don’t make a decision based on what someone else recommends. 
Have a great day!
RP