Almost all the nice stuff is functional and you'll probably want to upgrade to it sooner or later. If you have the money now, I'd say get the upgraded version now. If not, $100 is a great deal if the car is new or in great condition. Then you can upgrade it slowly. It will cost more in the long run. Trust me, I have a GT-4R that started life as a GT-4W and I've spent way more than if I had gotten it all at once. Then again, they didn't have the "R", "Pro" or "S" when I got mine.