Well, I am new K2 owner as well, but I think the difference may be that Calibre downloads are text only? where with Amazon sub, you get pictures too. Plus a free two weeks to evaluate before committing to buying is nice. I just spent the last hour reading through USA Today from Amazon and thoroughly enjoyed it. I have two weeks to check it out, but I suspect $0.48 a day is going to be worth it! We live in a fairly rural area so getting the paper every day wireless is going to be great! I think I am getting spoiled!