I own a Mediastation. I'm very happy with it. It's the BRAIN that controls all my "arrangers". I can do many things with it like surf the web, play along with videos and Mp3, play many Vsti from all the keyboards and do everything else you can imagine it is posible to do with any computer. But it's NOT an arranger. The Psr s900 and Pa500 are the HEART of my set up. Period.