I'm not sure ANYTHING in these price ranges should be considered 'disposable'! It's one of the reasons I'm prepared to put up with a bit extra weight - durability.

At these prices and above (especially the T2 and G70/E80) you can buy a passable upright piano, that with care will last your entire lifetime. For this kind of money, I expect a keyboard whose switches, keys and internal components will last at least as long (or well over a decade to be realistic). Unfortunately, component life seems to be one of the things that mid-priced (and sometimes TOTL) are prepared to compromise on.

I don't like changing my gear very often (unlike some here!), got 8 years out of the G1000, hope to get that long out of the G70 (unless they add a chord sequencer to its' successor!), and good quality switches, LEDs, displays and keys are needed to stop it being 'disposable'. Nothing worse than HAVING to get another arranger 'cause the old one died... (trade-in on my old G1000 saved me over a grand on the G70)

But, all that aside, those SA voices (especially if they've been 'tweaked' a bit more now they've been used a while) certainly make the new S900 worth it for all other than those already wedded to a 3K. For them to upgrade, I guess a used T2 might be the appropriate step up, although there ARE some here who downgraded to the 3K for some reason (?)......

Me, I think I'm going to wait and see if Yamaha will do a rack module MotifXS, and add the SA to my Roland rig (especially as Yamaha STILL don't consider that any arranger player could WANT 76 keys!)