I like quickoffice pro HD due to its cloud integration and ability to create new documents. also it's look and feel is closer to the original MS Office.
I got quickoffice pro hd for free from an amazon giveaway, but I really don't find it useful. None of the doc or docx formatting translates correctly between desktop word and the android v. A 1 page paper will become 1.5, margins will shift, and spacing will change.
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