My experiences are on Roland keyboards (arrangers).
E-600,E50,E60,E80, Va7, and G70
These are the touch screen models.

I also have experience with the button type OS of G series,BK series and EA7.

Although the Roland button models work well, the touch screen models are far superior for speed and ease. And combination models like on the G70 are unbeatable..

Touch screens are the way to go.
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