It has a ton of modules for easy use but I really like the plugin features with Open Graph that makes it possible to use the component on all kinds of pages from other components like Eventlist and Phoca Gallery.
I had some questions on how to use the component and I received helpfull answers on their forum very quickly.
One feature request maybe ;-)
My site visitors complain that they have to update their event page on Facebook and their eventpage on my site. If JFBConnect Could sync those pages it would be of great value and I would be willing to pay twice the ammount of what they are charging now. However I'm not sure if that's even possible.
In short, great component!
I found some bugs in the Joomla 1.6 version but after some forum communication the plugin was updated very quickly and issues where solved.
My tip if you have an issue. Post it on the forum. Help yourself and also the developer in improving his plugin. It is a free plugin after all.