Now that the Professional Services Tools Library (PSTL) is free, more people will be using them. However, the PSTL tools are powerful and this also makes them potentially dangerous.
Here is an example:
If you open PSTL tools, check Fiscal Period Modifier and click next you get some options to change the companies fiscal periods. So far, so good.
If you hit Setup Periods in Step 1 you will wipe out your current fiscal periods without warning.
Oops. Yeah. When I did this it was a pain in neck to fix the TWO company. I can't imagine doing it accidentally to a production company.