The ability to record tests and share them with clients and other teams. The UI is very easy to use and navigate. I like that it records everything in one place and makes it easy to find what you are looking for. I dislike how long it takes to create new tests. It's not intuitive and there is no way to see which steps need to be recorded. If you have a lot of tests already created, then creating new ones will take longer than normal. We use testfairy to help our clients understand the user experience of their app.