I find the ghosting is much more noticable if the lines of text don't fall in exactly the same position on every page, such as when there is a space between paragraphs that is not the same height as a line of text. (This occurs with books published by Baen for example, where there is often a 2 pixel space between paragraphs).
I think temperature also has a big effect: in cool conditions ghosting on my Glo is much less severe than in hot conditions. On a cold winter's day like today 40 pages between refreshes is fine. But on a hot summer's day I wouldn't want to go more than about 10.
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