My first replacement unit had holes and light issues, but no rainbow. The coloration appeared one or two days later. Today, I received one again. Paranoid as I am, I paid close attention when I set it up, and there were zero pink and green patches. By the time I was done setting it up, it had turned mostly green, with pink in it. I know I did not imagine this because I was paying extra attention, having gone through my share of replacement units.
In the beginning, I did not want to use any of them because I felt that they were not "mine" as long as I was still requesting replacements. Then when Amazon Andrew got in touch with me and told me to hold off on any more replacements while he was looking into the issue, I finally gave in and started using one of them to do extensive reading on. I have not noticed any degrading on that unit after putting it through many hours of reading per day. But it was very blotchy from the get go.
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