I dont really think one is better than the other. Sure, the K2 is newer but in all reality they are both great. I have the K2 and my sis has the K1. I personally like the wedge shape of the K1 and I think that makes it more comfortable to hold though I prefer the buttons on the K2. The SD card is not an issue with me since I dont feel the need to carry 38846593762090274503873498269762345 books with me at all times and as for the battery, by the time that I need a new battery on my K2 odds are that I would have moved to a newer and better ereader.
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