My original Paperwhite works just fine for me.
Most of the original units shipped as revealed on the voting at the PW page on Amazon have had no problems.
However, it does appear that replacements MAY be other returns re-shipped since most of the threads here indicate the replacements were not better than the originals with the screen defects.
If you do request a replacement, you could contact CS and request that your replacement be inspected first for screen defects before they ship it to you. I don't know if they can honor that kind of request but it doesn't hurt to try.
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