For me the: - Built-in dictionary - Being able to read anywhere, even when light is not available (on a taxi, for example) - Can fit it in my pocket - Less ann

For me the: - Built-in dictionary - Being able to read anywhere, even when light is not available (on a taxi, for example) - Can fit it in my pocket - Less annoying to read while lying down in bed, and the page is automatically marked when I fall asleep - Adjustable typeface and font size