Still curious why, if you need a 'backup' keyboard to your main arranger, you don't simply get ANOTHER S950..? Or, if money is the object, a used S910.

Maybe I'm confusing the term 'backup', but I am imagining that you are wanting something in case your S950 won't work..? Getting an arranger from a totally different manufacturer means you can't use your Songbook, your usual styles, your Performances, and basically puts you at square one so you need to try to look for alternatives, and program an entire evening's worth of Performances and Songbook entries from scratch.

Whereas another keyboard either identical or the previous one you had, all that work is done already, so when your main axe goes down, you pick up the spare and carry on like nothing happened.

It's the reason I have TWO G70's... I am not sure I would ever go out and but a Yamaha (or any other brand) as a 'backup'. I'd buy it if I wanted something ELSE, but I wouldn't call it a 'backup'.