We love how easy it is to write tests of new features, we like that I can easily see our code coverage at any time using Mangeonode or in CI with CircleCI! The UI could be better for non-technical people but otherwise great product so far!! Nothing yet. This should work perfectly if you want quality. It's perfect because my team wants me only focus about development while they do all testing (which needs much more then just writing some unit/integration etc). I like the ease of setting up tests, the ability to create custom data sets, and that it's very flexible if you are looking at multiple platforms/technologies. The UI can be confusing sometimes so there is some learning curve. It's also harder to find someone with experience in using this tool than other solutions out there. We have been able to automate functional testing for our application. This has allowed us to reduce time spent on manual testing.