It's a great tool for keyword research. I also like being able to have projects that keep track of how my websites are performing in the SERPs. Because the interface is so easy to use, it's great for finding additional keywords that are related to competitors' search results, your own results, advertising by competitors and lots more.
There really is so much data inside a typical search result in Serpstat that it becomes a bit of a rabbit hole as you look deeper and deeper into the data that's provided. Review collected by and hosted on G2.com.