great extension if you want to integrate linkedin on your site. very good support and so far any problems i ran into were more on the side of linkedin than on the side of the developer!
Oh... and it it is definitely worthwhile to RTFM !
FUA pro does exactly what it says it will do and even I as a very green newbie in website development and joomla usage could install and get the extension to work within minutes. One glitch which had to do with my level of joomla knowledge was fixed with one e-mail! Recommend to everyone who needs to protect certain areas of their site!!!