Yes, I've used it on a machine where the Disk Cleanup failed to work.
Does what it claims and seems to be quite safe BUT - make a restore point before you use it so that if the worst happens you can recover your stuff.
OnePlus 5 review
Best of the Grad Shows 2017: UAL Central Saint Martins
MacBook Pro 15-inch (2017) review
Comment connecter un MacBook à une TV ?