that thing looks pretty freaking awesome for freehand drawing/painting stuff.
other than that though, where's the advantage? notice the CAD drawings in the commercials aren't being created.. instead, they're being marked up on, noted, highlighted, etc.. guarantee the actual CAD work was done on a more traditional interface.
i'm not saying this computer isn't potentially leading into paradigm shifts for creative content creations, just that it's certainly not there right now as far as i can gather unless we're strictly talking painting/drawing.