Alternately, it's amazing and inspiring what just happened; other high-end car makers with a century of experience have shipped imperfect brakes for years (1) and only redesigned them on new models in response to complaints. Tesla, by comparison, is applying the Apple model (when Apple is at its best) of continuous over-the-air product improvement, which can change one’s sense of a product's value for money.

1. MERCEDES CANCELS BY-WIRE BRAKE SYSTEM; DECISION A BLOW TO TECHNOLOGY'S FUTURE. "When the system failed, the hydraulic system took over. But that resulted in a longer stopping distance and additional brake pedal effort by the driver." http://autoweek.com/article/car-news/mercedes-cancels-wire-b...

Well, I have the car and stopping distance was never an issue at all. With regenerative braking you start braking as soon as you take your foot of the gas so you’re usually stopping short of where you actually need to stop, not having trouble stopping fast enough. I really don’t think it was that big of a deal, but it could be fixed and so they did it to get the recommendation. And im sure it’s safer too which is what’s most important.

This was not an issue on all cars.