Most everything considered useful requires an in-app purchase. The actions performed for free can be done with other apps I already have on my system.
Example: The Cleaning section contains four items: Quick Clean, Unused Files, Cookies, & Duplicate Files. Quick Clean (cleans log & similar files) and Cookies can be performed by other apps such as CCleaner. Finding Unused Files and Duplicate Files requires an in-app purchase. Also, the Cookies section did not detect that I have Chrome installed on my system.
Example: Optimization section contains App Shrinker, Disk Health, Memory Boost & Network. App Shrinker requires an in-app purchase. Disk Health simply checks permissions like Apples Disk Utility. Memory Boost requires an in-app purchase, despite several free App Store applications that perform the same function. Hard to say what function the Network item performs. It says my settings are "Optimized," but doesnt say what it checks.
Uninstalling.