Thought I'd give it a go after a long time user of ccleaner.
Big mistake!
At the start it said no fragmented files. But after letting it run on a half full 3 tb disk for 12 hours i had to stop it as don't leave my Pc on 24/7
Sharted it off again today, I now have a 10% fragmented disk & estimated time of over another day!
Quite simply shoddy software avoid at all costs.