You may wish to watch the video using one of the high quality links on the right so the tool output in the case study is readable.
Ever have a situation in which your load test isn't passing the SLA, or the test results simply "look wrong"? Even when your test hardware is exactly like your production hardware? Is the problem somewhere in the code or... maybe something no one else has considered? How do you troubleshoot this when - like in the production environment - you can't afford to have invasive troubleshooting tools in place?