Once in a while, I play my DGX650. The piano action like feel seems to give me more control over expression.
Thats what the heavier keys do...
Having th same dynamic controll over synth keys takes more skill
Thats probably why i prefer the weighted 88 key hammer action..
Playing fast and furious organ and synth parts however works better on a synth/organ keybed
Espescially organ, where vellocity is set to 127 over all the range, and there is no dynamics.. same goes for many of the older analogue synth sounds... they are from before the velocity sensitive keybeds..