Interesting. Well, it doesn't have the special SC wheels currently used, nor does it have the "wing", so I guess that would devalue it some. Does it have the "supercharged" stickers?
If the full limited warranty has been extended, then it could be a pretty nice deal, but if it's just an "extended warranty", then I'm not sure since that extended warranty isn't as desirable.
It's also a 3 year old model, so no matter how you slice it (never registered, full warranty, etc.) it loses some value based on that alone.