I have used Chronon for several weeks during a very strange project. The project was about integrating a highly complex financial system in our own infrastructure. The challenging part about this financial system was that it was written in a multitude of languages (Java, Perl, C, C++, ...) and that it had to communicate with external services and it had hard timeouts built in which were enforced externally. So if something went wrong and I wanted to find out I had only 20 seconds in the debugger to find out because then the timeouts would kick in and there was nothing I could do about it. With Chronon I was able to step through the code after it had already run with no time constraints. Saved me weeks...

Chronon is also useful to find all thrown exceptions - even the ones who are catched properly.

I am not an employee of Chronon Systems and I only used their tool once but it helped a lot.