I got mine in the mail on Saturday morning. My second Kindle after the K3 which I have had for three years since it's release and been very happy with.
I held off getting the first gen Paperwhite after hearing so many problems with the screen. After looking at several video reviews giving very positive reviews I purchased the second gen.
As soon as I took it out of the box and booted it up I noticed a glowing pixel / pinhole
The screen is also noticeably brighter at the top and a little shadowy at the bottom with maybe a slight light bleed at the sides.
All in all very dissapointing.
I contacted Amazon with chat on their contact page and they said to charge it for at least four hours (it had about 50% charge when it arrived.) Then to do a full reset by holding the power button for 20 seconds. They said if this does not fix it they will replace it.
I thought the problem was probably physical and the charge and reset would not fix it, and when I did as they asked nothing changed.
So I will get back to them tomorrow or Monday and get a replacement.
If this problem (mostly concerned about the pinhole, the lighting isn't great but good enough for the moment) can't be fixed within a couple of replacements I will just wait for the next gen.