The traditional way of double-clicking a document file to open it and launch the app does not appear to work with ThinkFree Office.

I also find the apps to be very slow especially when dealing with the file system (ie opening, saving, navigating).

The document viewing modes are limited. I use the outline mode of Word a lot and this is not present at all.

The Table of Contents etc. are not completed properly when opening a Word document.

The app was unable to cope with a PowerPoint show (ie a pps file).

But my conclusion is still the same - it's OK for viewing documents.