Mine is the Yammie 3K.
I love it for the most part.

Onboard pianos could be more robust IMO.

I'd like to have the "in your face" drums and bass of Ketron....but I have tweaked what I have to beef it up a bit.

Having MP3 capabilities would be neat...and the S910 has that...but that is not enough for me to upgrade.

The build could be a little more sturdy...but not at the cost of added weight...so I can live with that.

Beyond that, I don't have any major concerns.

Eddie