I can't handle reading long documents on my computer. Kindle reading is much friendlier on the eyes and mind. Reading on the Kindle is closer to reading printed text on paper. At least in my experience.

When I go on a trip longer than 1 week, I used to take multiple books (4or 5)...now I take one kindle. When I want to buy an English book in China...log on to Amazon and download to the computer.

Its worth it for me.