Why I am not buying Pages, Numbers and Keynote iOS apps

I wasn't particularly satisfy with other iOS Office apps, but Pages, Numbers and Keynote are definitely not in my list of purchase consideration because:

• They ONLY support Microsoft Office file importing and NO way to convert documents back to Microsoft Office file format.
• They ONLY support iCloud and iTune file export, while others apps all support Google Doc and Dropbox and more.
• Feature set isn't impressive as US9.99 apps.

The more I look around, the more I think I am stuck with chosing between QuickOffice Pro HD and Document To Go Premium.