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Enhanced accounts have the advantage of being able to share files between users, including revision control, which details changes made to a file which is accessed by several users. You can even work at one same file at the same time as a colleague and, in real time, owncloud shows you who is editing what (text) with a differentiated color. If you have an existing Enhanced account, please open a ticket so that we can enable Owncloud in your account.
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For iOS, the paid official app costs also US$ 0,99. The only free alternatives we found for iOS are developed by universties that use ownCloud, such as South Oregon University's app (search for "SOU owncloud" in the app store), which does work if you specify our host https://files.emailarray.com
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We do recommend, however, the paid official app and can't be responsable for the apps provided by third party.