Sound wise it does not seem much different from the Yamaha S950 (Itself not exactly stellar) for the same price, so I think Yamaha had better start looking over its shoulder as Roland have a habit of launching a good model, and then at a later date bringing out an update that takes it to a whole new level. (Look at the G70 which was derided by all but Roland Diehards when launched, but the V2 update made it one of the best arranger�s available at that time)
Yet to see Yamaha bring out an update without forcing you to buy a new keyboard to get it

Bill