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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.
You may miss the open menu down at the bottom left when you have a color spreadsheet opened for editing.
Formatting options are also kind of lost down at the bottom, but as you can see most all of the ones you need are there.