I upgraded from the S910 and I thought it was worth it. The upgrade cost me $700 per keyboard. Over the next three years, that comes to $233 a year. I think that $233 per year is a very meager investment in a hobby, let alone in my case, a profession.

I really enjoy the new sounds and the slightly better styles and vocal harmonizer. If I were hard up, I would stick with the S910, but otherwise, I'd upgrade.