I just hope Yamaha will upgrade the S910. I'd spring for its successor sight unseen, but not the Tyros 4. At my age, the T4 is too bulky and heavy to tote on a daily basis. I'm on stairs and elevators gigging daily. Each model right below the Tyros, with its built-in speakers, has fit my needs to a "T". If no upgrade appears, the S910 will work just fine.