I currently have a S770, which I am likely to replace by a SX700.
Main reason is the fact that the new SX's apparently are using the same easy MIDI link feature between registration files and scores in sheet music apps that was introduced on Genos.
You simply load a registration file on the keyboard, load the corresponding music sheet in a compatible sheet music app, press a link button in the app. Done!
After that, loading the sheet, will load the registration file and also the other way around, loading the registration file will load the music sheet.
Simply Brilliant !!
Other reasons are the new keybed and the touchscreen.
All above reasons make that Genos and SX700 will operate much in the same way, which is my goal. And I will then have 2 keyboards that are very compatible in the way they operate and as good as do all I want them to do.
I am not a super great fan of the Genos/PSR voices though (a bit thin and cold to my liking), I prefer clavinova (or Ketron) sounds, but since I found (to my ears) little improvement in voice sounds between Tyros and Genos, I think probably they sound as Yamaha wants them to sound. And so I am not expecting massive changes in that area in the next upgrades to come.
Now as a big change in voice sounds would probably be the only real season left for me to upgrade after switching to the SX700, I am not expecting to upgrade ever again, and so will probably happily be using Genos 1 and SX700 for a long time.
Rudy