There is an advertisement on TV for the GMC Denali with active noise cancellation of the engine noise. I have used noise cancellation headphones to walk to work for many years. I really like them. They work best for the medium range frequencies, like the road noise inside my Tesla S. I would think that it would be an excellent option to have available since the quietness of my model S is one of the prime features I love about it. Personally, any option that made my Model S even more quiet I would be interested in. Any thoughts?