Source Coast's JFBConnect are on of the best of the best component for joomla, it is a must for everyone that wants to build connections with his users, a fast way to register on your site.
The component works without headache, with many settings and many ways to integrate with other Joomla components, that sometimes it offers more than what's needed.
It's a must have.
As for the Support! They offer a Great support through their forum, and that's why they deserve Five Stars all the way.