As far as I remember, there were huge issues with original PW1, and as you say, people sending back quite a few before either getting a 'good' one or just giving up, but while not perfect, the lighting on subsequent PW's have been a lot more uniform. You do still get some bad examples with shadowing etc, but far less than when the PW was first released. A quick and dirty estimate looking at the reviews of Paperwhite's gives you around 0.5% of them mentioning shadow, cones, yellow or gradient.
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