If I was a Yamaha player at this time I would wait for the next TOTL arranger as these new MOTL sound like a way for Yamaha to sell old parts, by adding & rehashing a smidgin of something new to bait people into buying it,.....the real changes IMO will be in the new TOTL model,...Tyros 5 or whatever they are going to call it..when ever it is released down the road at who knows what price. I'd say if you have a S910 keep it...not enough difference to justify changing at this point judging by what I'm reading.