Yes, it's really easy to use and set up, using a DMARC Wizard. You can set it up in monitoring mode at first p=none and MAU's will start sending you DMARC Reports in XML. There are a few sites that will parse the Reports to you and display the data in an easy to read format. You'll be amazed how many people actually spoof emails with your domain and won't hesitate to use the reject setting. Once you get it enable, it's always good idea to test everything, using a email authentication and configuration testing tool.