As a couple of people have noted above, there doesn't appear to be a single size for all uses. I use my 6" KPW for most reading, but my 5" Galaxy Player is better for short form reading. I'm reading this on my wife's 10" tablet, which is better at graphics, and was at hand.
I've read on screens from 2.5 to 20 inches. Personally, I think 3.2 to 8" is the best range of sizes for most text reading. For fixed formats (pdf, graphics) bigger is better, baby! My 20" is awesome for that, with the 10" tablet the min size I prefer.
Regards,
Jack Tingle
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