I haven't. But insofar as I have, primarily because it's the easiest way to read certain out of print works (from e.g. Project Gutenberg, Archive.org, DBNL, etc.) and because it's certainly more pleasant than any light-emitting screen. I also use it to read scientific articles and the like. Since acquiring an e-reader I have also added some DRM-free stuff from e.g. Humble Bundle to the mix.
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