Scott,

The PSR-S910 sounds more like the Tyros2 than the T3 (only natural, I guess).

I was one who liked the Tyros2's sound better than the Tyros3...it sounds "sweeter" to me.

The S910 has the registration buttons in the middle (so did the S900).

I'm very pleased with the S910...as Beaky says, it plays all the Tyros2 styles, and even some of the T3 styles (with a bit of tweaking).