I confirm for a long time the disparity of the screen at Kobo.
At our club, the first kobo ( bought in November 2012 ) had a background of very clear, clearer than the paperwhite and as clear as the kindle 4 black screen.
Then the version of kobo Glo have wallpapers darker than the touch kobo and much darker than the kindle 4 black.
This me recalls the first pocketbook test which had a dark screen, the last kobo glo purchased have a very dark screen.
But they have an advantage, in light they are friendlier than the first.
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