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This list shows that you can have documents from various online cloud services show up right on your iPad and Quickoffice provides the largest number of available services.
DataViz's Documents To Go product supports the same large number of cloud services as Quickoffice.
Documents To Go has a lot of functionality, but as you can see the UI is not as elegant as Quickoffice Pro HD. The icons for formatting are at the bottom and have no color and could be more visible.