I had a Sony Reader for about three years, then I upgraded to a Kindle Paperwhite while the Sony was still fully functional. It was an excellent upgrade for me, I'm much happier with the Paperwhite for a number of reasons.
I typically upgrade my phone every three years (although if a bigger iphone comes out this fall, it will be challenging to wait that long...) and my computer every five years. I have never upgraded our TV since buying a flat-screen about eight years ago. I guess that's why the TV business is tough!
eP
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