I like how good it is at identifying both internal linking as well as external link building, which makes my work easier (and more effective). The only thing that would be nice to have was an option where you can create your own list of tags in addition to those provided by default - this could make life even simpler when applying some custom tagging rules or creating reports using advanced filters/filtersets. It has helped us improve our SEO dramatically since we started working together with them 5 months ago.