I have the 2014 (212 ppi) version of the Paperwhite and now of course there is the 300 ppi 2015 version on sale for $99. Anyone used/own both? Wondering if the extra ppi really makes a difference for reading non-illustrated novels where the only illustration is usually the cover art? I could sell my Kindle back to Amazon for $40-44 but would rather not be put through the hassle and chance of a bad backlight if the increased PPI doesn't make much of a noticeable difference.