I just installed this on my site (endless-satsang.com) and while there were a few bugs unique to my situation, it has worked out well. The main difficulty I encountered was that I am using the JoomSEF SEO plug-in which interferes with some of the features of the web app. I was able to find work arounds that were good enough for my needs, and thanks to the free version I was able to sort out my difficulties while using the free version. Even though I am not yet a paid customer, the support I received has been excellent.
I am just a web site owner and not really a web developer or desgner, so the fact that I could get this to work fairly easily is a testament to how well thought out their system is.