Our site serves resource files to Physics teachers in Scotland and needed a rapid update. The old extension we were using isn't available for J2.5 so we had to find something good, and fast. This extension did the trick and saved us hours of effort and downtime.
The developer Artur is a complete gentleman, too.
Absolutely worth the nominal cost. The 700+ users on our site are delighted with the new dropbox access provided by this extension.