No problem. If you're going for simple social login features and easy customization of the login module looks, I don't think you chose wrong. There are quite a few simple social network integration extensions for Joomla that seem to work well, and that seems to be a well respected one.
If you're ever looking for deeper social network integration, JFBConnect is likely what you'll need. Things like importing profile information into other extensions (JomSocial, EasySocial, Community Builder, etc), Open Graph integration, social sharing buttons on your Joomla/K2 content, all the social widgets, Facebook Page Tab integration, creating posts for your content to Facebook, Twitter and other social networks, and lots of other things, then you'll have the solution you need in JFBConnect.
As noted, we'll be working on improving our styling features going forward to make things simpler, but if you have any questions or issues before then, just let us know.
Thanks, and best of luck,
Alex