I don't know that I'll ever be interested in e-ink or a dedicated e-reader, but with tech in general I only upgrade when content or software becomes available that my current hardware can't handle. New classes of hardware like tablets may be worthwhile, too, but I don't see the need (or have the budget) to keep up with incremental changes in every class of hardware I already own.
With just about any device, I aim to get at least two years use out of it, and often more like five, after which many of them find new homes.
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