This tool has helped us create high quality code in just minutes which saves time as well money by reducing errors during debugging of our application! The support team at O'Reilly were very helpful when I encountered issues that they couldn't help me solve myself even after many hours trying from different angles. Nothing much; but it's not too user friendly (not intuitive enough). It would have been nice if there was an option other than'single step through'. For example we wanted to debug one function out of several using this feature instead single stepping them all over again till reaching what point where debugger stopped working.