I am having trouble reading those big books - books with 600+ pages. They become kinda heavy and difficult to held while reading in the bed. (reading the middle pages - say page #300 to #500 in 800 page book - still manageable). Currently I am reading 'Shantaram' and that's a huge book (~850 pages).
So, I had downloaded a soft copy and I'm reading in my mobile (4.8" is small but manageable). Plus when in mobile, I can read few pages while traveling or even in office when I'm free.
Thought of buying a Kindle, but I love 'buying/collecting' books. So buying the hard copy, downloading and reading softcopy - well, doesn't make sense. (Sorry I have never considered buying soft copies.
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I had bought first two books of ASOIAF a long ago (got a very good deal. both books for 350 bucks). But they are still pending because of the huge volume.