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The dominant cause of difficulty in reading as one ages is loss of accommodation, the eye's ability to focus on nearby objects. Adding light is the traditional way to extend the time before reading glasses are needed, since enough light makes the pupil contract, which makes the field of focus deeper. I didn't RTA, so I don't know if they tested in direct sunlight, where I imagine there should be little difference in that regard, since the pupil will already be stopped down.
Someone said there was a "contrast" control that made the fonts thicker and darker. I believe the first, but not the second. I don't think the darkness of the e-ink globule things can be adjusted; I think the contrast, given a set lighting condition, is fixed.
I think two failures of current e-paper screens are much too low contrast, and too low in resolution. A magnified view (like at wikipedia) shows the sizes of the globes vary a lot. I suspect if they make the screens with only very small globes, contrast suffers. I'm not sure they will ever be able to do much better than today. Add in color, and things just get much worse.
My next reader will not be based on e-paper technology (I think "e-ink" is a trade name).
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