I am cooking mine in the desert sun every day. Will have results in a year.
And there are lots of studies to prove CIGS longevity. They have been around for a long time, but used to be much more expensive. I had no clue they would be an option in my lifetime. I have no clue what manufacturing processes made these available at such a cheap price.
On the other hand, normal flex panels degrade to 60% output in a year, in my experience. I used so many over the years on my rv's and on a minivan I lived in. Junction boxes used on these flex panels for bypass diode is garbage as well. I have had them crack on me in less than a year! And the traditional silicon cell they use is not meant to be flexed. Every time you bend it, micro cracks, or sometimes large cracks, develop and cause permanent loss in output. And damage the bus bars on the cell. It is plain silly.