Recommendations to others considering Progress Telerik Fiddler:
Play with it and really dig into the different "views" of the application. Not only will you learn more about what you're tracking, but you'll also learn about fiddler and about HTTP traffic in general. Review collected by and hosted on G2.com.
What problems is Progress Telerik Fiddler solving and how is that benefiting you?
The last time I used fiddler, I was trying to figure out how two applications for which I didn't have the source were communicating so that I could mimic the receiving application in a new code base. It was fairly simple to find the requests/responses for the two apps and get a rough prototype going in a matter of hours. Review collected by and hosted on G2.com.