I like that it's easy to use, but also gives you detailed information about errors in your code (where they are coming from). It has helped me track down issues with our front-end JS library we've built, as well as some bugs in our back end services! The UI could be better - there's not much information visible at first glance unless you drill into each individual log entry. We're using it internally at work primarily; however, I can imagine this would be helpful if you were looking for ways to help debug problems across multiple teams or companies.