I have been using this tool for a few weeks now and have grown to like it quite a bit. We loaded up some historical backlinks and found a few that had anchor text changed or had no-follow tags added. Bummer. We will be monitoring all new guest posts and other links using this tool so we find out within a few days if the links are changed so we can fix or replace the links before too much time has passed. The tool is not perfect but the devs are really responsive and work quickly to solve any issues that come up. They have a roadmap of changes and listen to feature requests. If you are spending money on link building, this tool is a no-brainer.