I stopped using their products because the "errors" they found always included the fact that I hadn't bought and installed every one of their products. It's also far too easy to miss that they have "conveniently" added downloads of them all to the list of "fixes" you need and suddenly you have all their other stuff installed on your system, too. They really buried where you could see that and uncheck it, even when you're looking for it.

Not for me, thanks.

IObit has proven itself not to be trustworthy over many years.
They traditionally do sneaky things that I didn't care for.
As a result I have uninstalled ALL of their software.

Don't take my word for it:
https://iobit.pissedconsumer.com/review.html

Installed, found that it pushes to install no-end of add on programs, so uninstalled.

Re the free version as opposed to licensed version.
The only thing I seem to notice between free and paid is the number of days that pass between having to do scans. Two days at most on Windows 10, with the free version.
The licensed version and sometimes I can go two weeks before having to do a scan.
It's probably due to the free version not cleaning everything it is supposed to do.
Other than that, a scan is quickly done, however I want to remind you, that if you are gaming, or doing anything that draws much RAM, shut down your game or project first before scanning with ASC.