I took various courses that had ebooks. Here are my concerns:
1. Could not take notes (highlight entries). Some allowed, but they were not portable among different computers.
2. Had to sit in front of computer for long hours. I could not read in front of a computer as long as I could from a DTB.
3. If it had any fold-out charts or illustrations, those were extremely hard to navigate through.
Now a lot of these can be fixed if they can be loaded on an ereader. However, the ereader will have to be big enough to fit a larger screen because better textbooks have charts, illustrations, tables, etc. that are usually larger than the average size of an ereader.
Still, holding a larger ereader for the amount of time needed to read and study from can get rather cumbersome.
It is a really good idea, but it still needs better devices and better implementation to replace text books. IMHO.
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