Not too many no-brainers on Appsumo. This is one of them. If you have SEO clients, they constantly want to know where they rank. This tool does it with both reports and dashboards for the larger clients. During volitile times in SERPs, you can check rankings twice a day. However, in many cases, monitoring the top 20 keywords about every 3 days is perfect if you are doing SEO for the long-term. I advice stocking up on some codes before they end. We've been using Serpwatch for several months and stocked up some more this time around.