I've been trying to find some informed speculation on the expected cost of the newly announced Tesla solar roof? Im surprised nobody has jumped in with informed estimations, at least of what the tiles would cost in comparison to asphalt and slate. I tried to find information and to me it looks like raw material cost of tempered glass per square foot greatly exceeds that of slate, but I am guessing that there are a lot of other considerations that go into that and I was hoping someone with some knowledge would want to weigh in.