The biggest change by far that I needed was a change of location for screenshots. A two and half minute Youtube video provided the answer. All the setting changes offered are quick and easy to changes to make. There's no way it's worth this price when the answers to so few changes are so easily found for free.
This is another iteration of adding preferences that Apple does not reveal in the GUI: TinkerTool, Onyx, Secrets, MacPilot and dozens more have all tried to do this: bring back choice to the user.
It’s graphically simple, maybe my parents could understand it. But there are not enough options to justify the cost.
Don't pay for these changes you can simply implement by yourself...
Been using the app as a beta tester, you soon forget about it but then realize you are less annoyed by the small little things like iTunes or the update notifications. Also i hide very often my desktop icon to make some quick nice screenshot
The only way I can answer the question "Which problem does this app solve" in a meaningful way, is in relation to its author, that is: "It helps paying my rent".
All of the included tweaks can be done for free in 15 minutes, the price is way too high for such a low-effort app. Extra negative points for the "... Great Again" branding.
Hiding updates notifications is pretty bad from security standpoint.
There are all things you can do with a simple Google search.