Mediocre at best
Have tried to use Documents Unlimited for Excel, Word, and PowerPoint files. While the Excel and Word files displayed properly, the PowerPoint did not. After working on a few spreadsheets and Word documents, I can say the interface is not user-friendly, and it is more time consuming to edit documents than it needs to be. The app connects to the server for most tasks, which makes offline use very annoying. I thought I would be able to connect once and then be able to work offline on my documents - not the case.
Jjustintime about
Documents Unlimited Suite for iPhone - Editor for OpenOffice and Microsoft Office Word & Excel Files