TrackJS is a great tool to help diagnose issues and track down causes. With the integration with Github (which is free) you can make sure you have the latest version of the code and help avoid bugs. I have had issues with the service. It's often slow to load and sometimes doesn't load at all. This makes it difficult to use with other tools and can be frustrating. I'd rather spend my time working on my code than waiting for the service to come back. It's a great tool and I highly recommend it. We use it to track down issues and fix them. It's also helpful to see where the issues are coming from and what could be causing them.
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