Configuration of Model 3 reservations is probably still much more than a year away, but I wondered what people were thinking as far as the "medical grade" HEPA filter that was introduced as an option on the Model X (available on Model S orders starting today). The HEPA filter system is bundled with the Premium Interior package on the S and X, which I think adds about 3k on the S and 4.5k on the X to the total price. Worth the cost? I am leaning towards yes. I wouldn't buy it necessarily to protect against biohazards, but I get annoyed when I'm in my Honda Civic and driving behind some vehicle that is belching noxious exhaust. Model X owners report that the upgraded filter system is great at eliminating this annoyance.