I am in the process of finalizing my order and debating about the subzero package. I know it is a new feature and no one has any experience with it on the model S but was hoping if anyone has had similar features on another car? Was it worth it? How useful are the wiper blade defrosters? The rear seat heaters are a nice touch but don't feel it is really necessary since you can turn on the heat remotely to get the car warmed up. FYI: I live in Ohio. Would love to push the "Confirm" button as soon as possible!!!