Very powerful with an extensive tool kit available to help you. You can "crawl" an IVR and map the entire Call Flow to confirm your documentation. Ability to build Test Case suites and load your sample data you would like to use to test with. We use extensively for regression testing. Review collected by and hosted on G2.com.
Takes a little while to fully get some of the scripting down but is amazing once understood. Review collected by and hosted on G2.com.