I bought Atticus when it came out just to format ebooks. And it did a great job; I even put custom images on the first page of each chapter in my very first project!
Soon after I found myself writing in Atticus instead of Scrivener. Honestly, Scrivener has the best research/note features (I write fantasy and science fiction so this is important) but Atticus does not require the use of Dropbox and one license let me work on Mac, Linux, Windows and portable devices (unlike Scrivener). Atticus is my writing and formatting software of choice!
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