Scott as subjective as this will become I would suggest to avoid all the nonsense that usually comes out of a question like this....is to Listen to the all the demos, look at all the Videos, read all that has been already said go & go spend some time play one for yourself and make a personal assessment being your a Yamaha user already you should have no problem making a decision if the S900 is for you after all its only a $1500 arranger not a life changing purchase. YOU have to make the choice with YOUREARS for YOUR Needs.

Good luck & keep us posted on your progress & thoughts.