I'm a little late to the discussion, but I'll just say that I have mixed feelings about the keyboard on the K3. I enjoy the fact that it's there, but I generally don't like the keys themselves. They feel too small and round, like cell phone keys, to me. It feels inappropriate for something the size of the K3. I would've appreciated keys that were a bit more oval-shaped.
I make use of the keyboard to enter in my Wifi password and to shop on the Kindle store. I also sometimes take notes on it. It's the note-taking that's the most challenging, obviously.
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