There are 5 grand piano voices that differ enough to make them distinguishable, but all sound great whether playing through the speakers or through headphones.

Some voices are more muted, others more striking.

The voices on it are really accurate as well

When played through headphones these other voices are good - not as good as the main piano voices but they are good.

The five grand piano voices are really nice to have.

And if you put it in a flight case, it's still going to be under 50lbs for travel (even though you'll still probably get charged for the extra length).I was disappointed that Casio did not upgrade the grand piano voices from the PX150