What's the point? I'm all for tech, but unless you are regularly carrying a load blocking that view, it's just something to add cost and potential problems. I love all things tech, but seriously, a digital rearview mirror when you can see out the back window 99.9% of the time is just pointless.
Now, I do like the digital rearview that you can get on the GM trucks when towing a trailer. That is a useful tech and not just using technology just because you can.