I use QA DNA for ongoing quality assurance testing of our software, and they have been really thorough. They check for regressions and find new issues that our team might miss. I love that their team consists of engineers who can understand the technical aspects of the projects they're working with. They have helped us develop test cases for new services and ensured quality before launch, catching things before our customers did. This expertise has benefited our projects by allowing better quality in the field. It's great that they are also very responsive and available over Slack, letting us focus on development while they handle the QA. They initially started working with us when we were a small startup, and they've continued to support us through our growth and acquisition, which shows their reliability and commitment.