But, the hard truth is that the PA-800 is marketed as a home keyboard and the majority of users would expect decent fill-ins that would be more forgiving than the PA-800's "spot on" approach to triggering them.

I 've said this before Ian. Play one yourself if you get the opportunity. I dont understand the fill problem as it does not exist on my PA1X and even though my timing is very good (even if i say so myself) i have tried to trick the keyboard by pressing the fill buttons just out of time and it accomodates my eror flawlessly.

Anyway. Its not the right keyboard for everyone and there is a lot of choice as i said earlier.