Hi Dennis
Actually you will find that most European manufactures use Fatar (Italy again) keybeds in their instruments, which is why Korg, Ketron Wersi, Lionstracs etc feel the same.
As to the SD1 you will find it is a cracking board (Even though it’s quite old now 4 or 5 yrs I think) and easily a match for other mainstream manufactures, however the OS is not the most user friendly, but stick at it and you will have many years of enjoyment.

Bill