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I went through four and gave up. I decided to stick with my original unit, as its problems were the least bothersome.
All four had the problem of shadowy color blotching to varying degrees. #2 and #3 had bright spots like dust trapped between the screen layers that were extremely distracting. #3 and #4 (and maybe #2?) had super-bright leftmost LED lights. #4 was the worst as far as the coloring. Extremely pink blobbing. It also had very noticeable secondary diamond-patterned shadowing at the bottom worse than the other units. And it appeared to have a scratch on the backside of the topmost screen layer.
Interestingly, they all had different grades of brightness when on the same settings (at least compared to my original, which I kept thoroughout the process). Some also seemed to have sharper text.
On the whole, I'd say the quality control on these is deplorable. Electronic devices shouldn't have such a wide window of variation.
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