The Profiler (combined with Method R) has enabled me to resolve performance problems that could not have been resolved in any way other than by pure luck. The return of the modest investment cannot be beat. I saved a failing project as soon as I got it. I highly recommend it over the so-called “free” stuff. The authors of the free tools are trying to contribute to the Oracle community but I found it detrimental to my efforts. And I wanted to kick myself for trying to write my own for so long when I should have conducted a simple buy-vs-build assessment.