Kindles are actually better for my migraines than paper (because I can make the font the same size no matter what book I'm reading, and it seems less reflective than certain types of white paper) so I've been using my Kindle for pretty much all of my prep work (I'm not at uni yet but I've been doing a lot of reading for my subject). With journals, though, I think I too would need to print and scribble. The only thing I don't like about Kindles is that it's so hard to dip in and out of a book/paper or flick back and forth between pages the way I do with books.