Good things I liked about the kindle dx:
1. Large display - which makes reading easy and rendering pdf files easier, as it will fit nicely on the screen and it'll still be large enough to read comfortably
2. Very long battery life - since it uses the e-ink technology instead of a back lit display, power is used up only when you press a button. I use it everyday for up to 3 hours and the battery can last me up to 1.5 to 2 months in a single ......