I had one in my BMW 750 before I got the Tesla and really loved it. That and the seats are the two areas where the BMW was superior to the MX. I've looked at the Hudway but as far as I'm concerned it is a kludge and really doesn't do what an integrated HUD can. And who wants a device like that sitting on the dash.
The design of the MX on the driver's side is conducive to an HUD but like true iPhone integration it doesn't appear to be on Tesla's list.