I think its up to you and how good you take care of stuff. Unfortunately, I'm not so good. In the last 10 years or so (????? can't remember exactly how long) I've gone through at least 3 PDA book readers, and ebookman, a Cybook, and now I'm on a Kindle 2. You can probably get better life than I do, but for me three years would be pushing it.
On the other hand, I have seen messages from folks that had Rocket books. I suspect that some of these folks are on year 5 at this time.
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