I have used Ccleaner for many years and never had a problem with it cleaning the registry or anything else. It allows you to make a backup of the registry changes so you can put them back if there is an issue.
The CCleaner registry cleaner doesn't really free up space on your PC, and doesn't write or erase much on your SSD. It is used to cleaning up your Registry, and supposedly makes your PC run faster by being more efficient. I have used it many times, but haven't noticed any differences, neither have I had any bad experiences, so use it if you think it works I guess. Just remember to make a backup of the database.
That's the cleaning part. No, I don't save that much with the registry cleaner alone.
Well...that's what we were discussing, and the title of this thread.
With Ccleaner, the registry changes it makes are about 1K in size as it only saves the changes it makes for the backup. I don't see much of a speed change as I am using an M2 drive with 32GB ram. I used to notice Windows 7 used to slow down as the registry got more and more entries. I haven't noticed my system slowing down after 5 yrs without a reinstall using Ccleaner.
Now to the OP, yeah, don't run the wipe free space unless you are VERY security conscious as it wastes write cycles on an SSD.