I tried this extension in some different configurations. Now i'm using it on a joomla 1.5.25 with Virtuemart for an e-commerce site. All work perfectly together. It requires some more work to do with language files, but the support is fast and exellent! The language files may be managed for correct infos to those who register into the site (using email instead of username) in email sent for registration by joomla! or its components. Nice price and exellent help from developer.