The only problem I have heard with the nano-film technology is the lifetime of the panels. What I heard is 10 years, versus the 25 year warranties of the amorphous film Unisolar tech and the various crystalline techs.
In inquiring about panel costs for the new nano-film panels, the costs were high, and the panels large output. I suppose to get payback for than expensive machinery earlier. I think they would do better to lower the price a lot and go with the volume of sales. Perhaps they have already done that, but I haven't seen nor heard of it. Changing panels every 10 years is not good.
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