What is the difference between Performance and Performance+ in the Model S? And in your opinion, is it worth it? also, what is the price difference between the two? I assume the biggest jump in cost is buying a P85 over a standard 85. I'm getting the Model X, which I assume will also have the same option choices. We are nowhere near the ordering stage, but trying my best to prepare and get a feel on how much the extra options are going to pile up!