For me it's the screen annotation which is the "killer" feature on the 600. I create a lot of my own eBooks, and the ability to "mark up" errors on the screen as I'm reading, and then go back through the annotations to correct the errors is a huge time-saver for me. Previously I used to have to carry a (paper) notebook around with me and write down all the errors in that. Being able to simply "draw" on the screen is great.
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