You will end up with the best open source teaching system on the best CMS. I know the developers are working on simplifying this, and there is room for improvement, but it is still an excellent bridge for your courses.
Import and Export are truly outstanding, and actions on the existing users and bounce handling are great time-savers. Overall it is a professional application for any business, and the level of integration with Joomla, Social Networking and Ecommerce is worth the price for the Enterprise version.
Do yourself a real favour and see how a component should be written.
However, negatives aside it works very well and looks good. The very best feature (what I was looking for) is the location cache so you are not constantly going out to the weather site to pickup data, a problem as it slows your site down badly.
Fix the little issues and it would definitely be 5+ stars.