I do think Mainstage is a great option for Live playing if you own a Mac I am hoping that the new IPAD pro will have a Mainstage option that would be cool also I am very interested in you opinion of the Casio PX 560 I am considering one as well .
I doubt it will be the same thing running on ipad, the mac version comes with over 100 GB of sounds.
But on my ipad i am using logic remote, which gives me direct touchcontroll over mainstage from the ipad..