If I get a PDF at work, I read it on my laptop (usually plugged into a docking station with an extra monitor), but if I'm reading at home, I nearly always read them on my iLiad. That's true for fiction as well as non-fiction (e.g. journal articles for my grad classes).
I prefer other formats for fiction, but I'm reasonably happy with the visual quality of PDFs on the iLiad. I like the annotation capability, too. I would much rather read a PDF on my iLiad than get a printed handout from the instructor.
I'd say your survey needs another option ("I read it on my eink device").
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