I mostly upgrade when something breaks. But that really goes in spurts. My daughter and I were happily using our k1s - I left mine on the train, and she broke hers. Got a K2, and sold both the old. Then, happily going along with K2s, until I saw the nicer resolution with the K3. Well, I got the K3, and I left everyone else with the K2s (I read more than they do). My husband left his on the plane, my daughter broke hers, so everyone had K3s. Well, I had to get the K4, and the KF, just because. My daughter broke another one, and I got her a K4. She thought the KF was the next one, so I imagine that will break, soon.
Whatever the next one is, I will probably get it. I am really, really salivating over that Nook Glow
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