I’m something of a sceptic when it comes to eReaders.
I don’t have that much experience of them to be honest, but the beautiful functionality of them does not seem to compare to the tactile experience of physically reading a book. Nor can the buying experience of the download compare with the browse in the bookshop.
Consequently, this article in The Washington Post got me thinking: The case against e-readers: Why reading paper books is better for your mind
As for more concrete evidence of the effectiveness of the printed book, The Guardian provides this useful article based on recent research: Readers absorb less on Kindles than on paper, study finds