> It seems pretty obvious that you needed more efficiency for it to be a viable rooftop solution but the guy who set this up claimed that the fact he could just stick down some velcro and stick on the cells opened up some different use cases with cheap and lean installations supporting cheap cells.

I imagine one end-case could be using this as a cladding material, you could cover buildings, and the low efficiency would be balanced by the low cost.

The major problem is that these materials are unstable and degrade quickly, if you can get the lifetime up from 5-10 years now, to 20-30 years, then it really starts to look attractive.