Not really Chas...I'm sure the S910 can be made better, but I have no suggestions...still, the next S-series will probably be better in some way, just like the S910 was a tad better than the S900, and so on.
I like surprises. Most times Yamaha adds something really cool I never would have thought of...they are like the Japanese automakers...incremental change is the norm...and, it seems to work for them...also, they rarely delete useful functions, but seem to, most always, add new ones.
The S-series is inexpensive enough to allow me, and many others, to trade up every three years or so, or to skip over a model and then trade up...the cost of ownership over that period of time, is relatively low compared to other hobbies.
Ian