I coughed up the extra money and got QuickOffice Pro when I got my iPad and it has been so worth the money. It's specifically for MS Office documents and has a PDF converter and was upgraded recently to include features like word count. Only downside I've had is that you can't upload files directly into Dropbox (though you can take files from Dropbox and open them directly in QuickOffice.) Don't know about any other Word compatible programs. I've been happy enough with QuickOffice so haven't tried others.