Worried that your extension will be created, things will be running along smoothly and then - OOPS!  You find a bug.

Don't worry, we fully support our extensions for a full 6 months after completion of development.  Any bug fixes, glitches or kinks that you find through use of your extension we will happily fix - without question.

Joomla! upgrade cause the extension to break - again, provided the upgrade is not a major version change (i.e. 1.0.x to 1.5) we will quickly make any changes necessary so that your extension is again fully functioning.