I'm thinking about getting an iPad for the purpose of reading textbooks for what I'm studying (VitalSource format). I still have a lot of doubt because of the LCD screen which may be straining. I'd like to ask if anyone here has read ebooks on the iPad for hours at a time, and how did you feel about that? I'd probably need to zoom in to read my books, which may mean a lot of panning. Other e-readers are no good for me due to a lack of support from my textbook provider.