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Really, though, what makes the Kindle so successful isn’t what Amazon added to it; it’s what Amazon subtracted: size, weight and price. Nook’s two-screen setup makes it fussy and complicated. Sony’s additional screen layers make the E Ink less sharp.
In the meantime, certain facts are unassailable: that the new Kindle offers the best E Ink screen, the fastest page turns, the smallest, lightest, thinnest body and the lowest price tag of any e-reader. It’s also the most refined and comfortable.