I play a Yamaha Motif ES 8 at one church, an S90 at another, but I own a Kurzweil K2500XS. Kurzweil is most user-friendly board I have used with the best piano sounds - in my opinion. The S90 has more polyphany, but the notes cut off sooner than the notes on my Kurzweil. I still think that Kurzweil is the best, even though their boards aren't manufactured as much as the past.