I've had the K1 for more than a year and a half, and have had absolutely no problems at all. While I bought an extra battery just in case, the original is still working perfectly, and I read several hours every day.
My son bought a K2 and it is very nice, but nothing at all that would make me change at this point. I particularly don't like the fact that the K2 does not have a user replaceable battery. If it ever dies, you have to pay a lot to have it replaced, plus you will be without it for a couple of weeks or so while you send it in, wait for it to have the battery replaced, and wait for it to be shipped back. That alone is a deal-breaker for me.
If my K1 ever dies, I'd still look for a used one, but if no longer available, then I could live with the K2. I don't see anything it has that would me change now.
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