This extension should be part of Joomla! core. Have not encountered anything negative in regards to this plug-in. It is worth the effort to learn how-to set it up, as the author has taken time to understand Joomla!, and delivers this functional extension free-of-charge with free support (unlike many other extensions).
Would like to thank the author(s) & developer(s) of this extension, as it is among the top 3 extensions in the “must have” category for any web site, regarding SEO.