Unfortunately I can't vote in the poll as the options don't fulfil the OPs question.
Due to the current screen size limitations (and the lack of colour in e-ink) I don't use my reader at all for magazines.
All fiction books are read on the reader, but for reference works I find either paper copies or computer screen and search a better/easier/more versatile option.
Of course I still have books where an emotional attachment would not allow me to part from them. And I'll still be picking up 'signed' copies if/when I see an author I like in a book store, meeting their fan base.