The Apache Solr Search Integration module project page states:
Solr search can be used as a replacement for core content search and boasts both extra features and better performance.
What exactly are these extra features? (Or if there are too many, in what kind of use cases would I want to use Apache Solr?)
My site is hosted on Pantheon and they provide Apache Solr at no additional charge. Would this be something I definitely want to set up? Only set up in certain cases?