I kinda question the validity of any article that uses refresh rate to discuss whether it's a problem reading on the lcd versus e-ink. It sorta hurts their credibility. As 5thWiggle talks about, it's a lot less relevant of an issue on lcd panels.
I do fall into the camp though that feels there's something about backlighting that has a different effect on people than the reflective lighting on a e-ink panel. I myself definitely prefer reading on an e-ink device over an lcd device (except for pdf's, and that's more of because it's just easier to deal with a pdf on a tablet). The ipad2 I found to be just generally pretty bad because of resolution issues making the fonts not look that great, but even with better displays like the ipad 3, or my galaxy s3 phone (which while not at the ipad 3 levels, is still noticeably better than an ipad 2), I just don't find it comfortable to read for long periods of time on them.
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