The very latest iLiads are using Vizplex EInk film, which the ones from 2007 were not doing. However, iRex has not made a big deal of this because they claim that there is almost no difference between the old and new screens. On other devices the switch to Vizplex made a big difference, but iRex is using their own display controller and got much more performance out of the old film than others did. I don't see much difference between my Kindle (Vizplex) and iLiad (not Vizplex).
I am surprised that there was little difference to the Libre. One advantage of the larger screen is that you can use a larger font size for the same number of words per page. I also like a bold font (to reduce the contrast issue), which is one reason I use FBReader rather than MobiPocket Reader on the iLiad.
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