Gary yes they have made a few design changes that benefit some players but many times they were so minimal between models. I would say a PRO division and Home player division is needed in the arranger KB department here is where the controversy lies as Pro players need certain features for every day gigging that the home player doesn't. That said the keybed keyfeel 61/76/ choices problem on MOTL units like the S970, etc,...
needs to be addressed to satisfy the masses and continual requests are posted all the time with no results, and a simple LARGER Tilt up display on MOTL units also, these are very beneficial to the pro player. And one of my pet peeves besides a new Vocal Harmonizer on par with TC Helicon is a MUCH SMALLER FOOT PRINT in size & weight of the KB. Gary they have a some more to do for sure....
remember the story of David & Goliath....just sayin'