At least for the Model S, I disagree it is all but useless while driving -- it is one of the most useful features. I have left the camera on for the nearly 3 years I've been driving my Model S and it is probably the highest value info that can be displayed on the 17inch screen. One of the features I miss most when I drive another car. Basically a forth mirror, and a great supplement to the traditional mirrors. Not really a replacement, but super helpful none the less. The wide angle lens doesn't give much detail far away, but it works out so that if a car is small in the camera, it is almost always safe to lane change, and if it is big it means the car is close and probably not safe/polite to lane change.