I have not found any lighting variations. The screen on my 32gig wifi/3g is the most even I have ever had. No cones either.
The back is slippery but the rubber side helps. That said the cover on mine fits and holds beautifully and gives a very comfortable yet think hold.
I have not compared graphics on the screen but the text looks sharp and clear. That may be a per unit variation. Then again, I don't think that any e-reader has approached the limit of optimal sharpness and contrast.
Great reader so far (fingers crossed).
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