Although i have not played the XS myself i have read a number of user reviews on the Motifator forum od individuals who have auditioned the instruments side by side through the same sound systems and watched all the demos of the XS on that forum. I have also seen and heard all the demos of the motif ES and really cant see the great advantage if at all in moving to the XS. The XS has the expanded articulation on some voices and has more intelligent arps than the ES but thats really all i can pick up as being significantly diferent. If i had the ES i would need far clearer musical reasons to trade up/sideways to the XS.

It may well be that the OS system is more intuitive or integrated but is hat enough of a reason to switched boards ? I am just throwing that question out there....