Still rather have a plastic logic.
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@cdwilliams1
I carry all my books. I commute 25 miles with my wife into town when she works, so I need everything on me. No lockers on this sprawling campus anymore, and she has the car - so I get a broken back.
When talking costs, let us not forget the value of conservation - eBooks versus paper have a value that is not directly computable. In my area, buyback is not 80% but more like 20%, so a new eBook with online software access is the same cost as the used book that doesn't have the software. The buyback value is less than the cost of online book access, so I loose with used. Finally, let us not forget the cost savings you have on your personal books (pleasure reading - you all still do that, right?) and the convenience of having your entire library on you to read at a moments notice (backup up, of course).
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However, there is one big drawback that ReciprocalInhibition hinted at - often times I need to have 2 or 3 books laid out in front of me. I cannot do this easily with an eReader, so I think I would need a couple at least.
Oh well.