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When is the right time to buy a new/emerging technology?
The short answer is that it's never the right time to buy an emerging technology. As long as the technology is emerging, you should expect that newer revisions will be both better and less expensive. With solar, specifically, there are some tax credits to help the early adopters that may help you on the cost/benefit analysis, but in the end, you still have to decide whether the benefits outweigh the costs now, and if not, whether that will change in the near future. For me, part of the solar benefit is the ability to generate electricity when the power goes out. That option does require local battery storage, however. One of the benefits of using Musk's solar tiles instead of actual slate is the weight of the quartz tiles which is much lower than the weight of real slate. In many cases a slate roof is heavy enough to require major reinforcement of the roof trusses before installation. The lower weight also saves significantly on shipping costs. This is where Musk can lower costs enough to be competitive to some of the materials he hope to compete with.