There's another problem with PSR keybeds which is they become too noisy if you play them as intensive as I do. Although I don't know how instruments by other brands will behave.

I was told once that noise can be eliminated by changing the oil inside the mechanism.
A repairer told me that he could do it, but added, that PSR's are not designed for this procedure. He says that the whole construction of the keybed gets too fragile when it's being dismantled.

Also, I think there are different types of PSR's keybeds. I think that entry-level PSR-E4xx have in fact tighter keys than 700/900 series.

Anyway, any keybed requires some time to get adjusted.
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from Russia