We recently got a quote and preliminary design for solar panels installation from SolarCity (interestingly, it's still called SolarCity, not sure why). We then went and checked the online price calculator for Tesla Solar roof tiles. Obviously the panels are cheaper for now, plus there's a federal credit to take advantage of. But I'm hesitant to put down $20K into a technology that appears to be quickly changing, and we don't even know the full set of features/advantages of the solar roof tiles yet. Can someone with enough experience and knowledge please advise? Mucho thanks in advance!