My Kindle PW has a tiny bit of bleed (about 7mm long) at the lower left too which leaves a somewhat brighter spot on the screen. It's only visible when I'd use it in a very dark room; a room dark enough to make the Kindle easily look like an LCD-screen even on lower settings. I never do that, so I don't ever see this problem (if you can even call it that), and therefore it doesn't bother me.
You have to remember that the Kindle, or any other front-lit reader, do not have an LCD-screen; they'll never be perfectly even at this point in time. Maybe the KPW2 will be somewhat better on an average basis, but I assume that we'll still be seeing the same complaints, allthough maybe a bit less. It's inherent in the front-lit technology, as bad viewing angles in TN LCD-screens are inherent to them.
If you swap this Kindle for another one, or even for a different front-lit reader, just be aware of the fact that you may just be exchanging one problem for another.
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