I understand your frustrations with Joomla 1.5. We actually still use it on this site, but are working on moving to 2.5 right now
We want to be the last providers to support Joomla 1.5. We feel we owe it to our longer term customers, but wouldn't recommend it to any new sites or would recommend upgrading if possible.
Anyways, should you have any questions or other issues, definitely let us know.
Best of luck,
Alex