I was quite nervous going in about not having any physical textbooks, as I was afraid reading from a screen wouldn't be effective, but it's really worked out nicely thus far. I also have an ipad, which is a lot easier on the eyes when reading 10+ pages in one sitting since it can be held closer to my eyes. Even without a tablet I think the benefits outweigh any disadvantages. You can search your entire library (including your notes that you've typed) at once and open up any images or figures as full size high quality images for copy/pasting into review slides or whatever.