BIG Question: Is it the demonstrator or the keyboard itself?

Part of the problems with the Pa3X demos heard so far is that they're only heard thru its add-on speakers. For a proper sounding demo, they need to be line out recorded directly from the keyboard itself. If I buy a Pa3X I'll pass on its unattractive looking (audience distracting) and unimpressive sounding add-on speakers. I suspect it's those speakers that is ruining the Pa3X's initial impression, at least to my eyes and ears.

As far as Martin Harris doing a Pa3X demo: I doubt he'd do it at any price as the Pa3X is direct competition to the Tyros 4, of which Martin Harris & his team both designed and produced from the ground up.