Trying to upgrade from the Aura One is tough. It's not a question of whether the Sage and Forma are better, but whether the marginal improvements are worth the $ if you already own a working 8 inch ereader with most of the same features.
It's completely different if you happen to own a PW3/PW4 and are thinking of getting the new Paperwhite. New Paperwhite is less than half the cost of an 8 inch ereader.
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