The keybed on the PAXPRO is the:
http://www.fatar.com/Pages/TP_8PIANO.htm

And it works really well for me.

Not too weak, not too springy, not too firm...just right for general playing, IMHO.

I also will have to say that I liked the T2 keybed pretty well (even hough they are prone to troubles in a few years, it is said)

Lee