Ian,

I can confirm that the action is still tight and silent like the first day.
And you are right about Mike Martin: he is one of the most supportive rep I have ever met, in every way: he still programs new sounds, free to download on the Casio Music Forums: digital and acoustic pianos, gritty clavinets (a la Stevie Wonder), luscious pads... every week you find something new and worth the download.
I think that Casio deserve every kind of support in this effort to make instruments of professional quality available at such low prices: imagine a Tyros 5, a PAX-3 or an Audya for sale at less than 2000 dollars... who could resist?