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The K4 is much faster than a K3. It has the same storage as the PW.
If all you want is a reader the new K4B is an amazing little reader.
Two weeks of battery life if you are a heavy reader. I read 3 to 6 hours on it a day. The K4B contrasts is much improved compare to last year's K4S. For $69 it's not a huge risk and well worth the price.
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