It turns a complex, potentially dangerous task (partition management) into something you can handle from a keychain. It’s the difference between “Sorry, I can’t help you today” and “Give me two minutes and my USB drive.”
If you own the Technician license (which costs more but allows commercial use), the software includes a "Portable Version Builder." You run this tool, select your USB drive, and it automatically installs the portable environment. aomei partition assistant professional portable