I ordered this component on a Friday a.m. expecting the download to be immediately available. I submitted a support ticket requesting the download asap.
Over 24 hours later (Saturday) I received the download. At this point I figured out another alternative.
Out of curiosity, I installed the component to see if it was easy to configure and met my needs. - The help is lacking in any real details and you have to edit .php files to change the titles.
I don't appreciate that they don't have trial versions for Joomla 1.5 and that your only option is to purchase. They state that they will only issue refunds if the your server software is not compatible. I have never come across a company that is not willing to issue a refund -- who cares what the reason is. If the customer is not happy, then give them their money back. I have no interest in their source code which is another reason they won't issue a refund.
Do yourself a favor and go to moodle.org (Moodle is a Course Management System (CMS), also known as a Learning Management System (LMS) or a Virtual Learning Environment (VLE). It is a Free web application that educators can use to create effective online learning sites.) and download a stand-alone version and then create an external link from your Joomla site. This may have a learning curve but the software has a lot of flexibility and well worth your efforts. You can also brand it to your site.