I read dozens of books on my Sony PRS-505 and I loved the way the text looked on the screen. I thought, "well, this will be much better on my eyes." Now that I've had my iPad, I've read several books, including reading for many hours straight, and I haven't felt any eye strain problems. There are many who prefer eink, but I think once actual scientific data is collected, the amount of difference in eye strain between the two types of devices will be relatively small.
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