I am still amazed at how people are refusing to understand what the mediastation is to serious professional arranger players.

To say that all that can be done on the mediastation can be done on a computer demonstrates a lack of knowledge about the mediastation.
I would definitely prefer an upgradeable arranger with my choice of giga and other high quality sounds and the ability to import almost any style.
I would not want to carry a regular computer on a gig.

The only way we can know if the mediastation sounds good or not is by playing it in person. An online demo really does not tell us how good or bad a keyboard sounds.

But having said all that, to get back on topic, the new Ketron could be a step up from the mediastation and Tyros 2 if the user interface is easy to use, the sounds and styles are customizable like the mediastation, the OS is stable and is reasonably price.