You might get more responses in the Keyboard forum or in Midi Mania.
I've been looking at it too, and they say you 'need at least one Native Instruments plugin' to make it worthwhile but as to exactly what that means I dunno.
In the Sound on Sound review they said it was kind of like the IPod --- filling a need we didn't know we had but it becomes obvious after it's been on the market for a while. They say it's well built and the knobs are smooth and solid.
As far as I can tell it pulls together all your plugins, you're responsible for categorizing the sounds ('sharp', 'warm', 'squishy', 'plasticy', etc.) and then you go. Oh yeah --- you need to decide on a per-plug basis which parameters you want the eight front-panel knobs tied to.
As you may be able to tell, the whole Kore thing doesn't exactly light me up. At least not right now.