Hello everyone at Moz! I wanted to add some new information that I found.
Yesterday I commented here that you should not use a service like Yext because it seems overpriced, for something you can do on your own. Some sites like foursquare.com do charge a fee. Other sites like local.com, make it very hard to add your business. Local.com continues to redirect me to Yext. I will say that Yext does provide you a good report showing what directories have your site listed. From there you can go on your own and work to add your site to all the directories.
I still think Yext is overpriced and it is better to do the service on your own. Hire one of your marketers to spend a few days working on this. At least this way you can be sure that all descriptions and information is unique.