Using regedit and trying to identify what specific registy entry corresponds with what particular program is a disaster waiting to happen for the novice user. I have used many registry cleaners over the years and have never ended up with a "door stop" for a pc. Orphans and duplicates may be harmless, but they take up space and hard drives cost money. And yes, Auslogics gives you a performance benchmark before and after registry defragmentation. The diffrence can be a couple of seconds boot time.