As an ES6 owner it's a somewhat familiar piano sound. It's a bit hard to tell from the demo what new subtleties are present. I like it, although I prefer the mellower, darker variations. It looks tweakable enough.
The rest of the sounds appear serviceable though not jaw-dropping.
This would be a studio piece for me, so the selling point is the action, although I'd have to weigh it versus the VPC1, the ES7, and maybe the RD800.