I downloaded and tried the subject program. It scans very fast and didn't find any malware on my Mac. So, does it work? I don't really know, but Tom, a writer I respect, thinks highly of the program. You can read his article here. It only makes a scan for malware when you run it, it's free, and recommended by Tom, so I thought I'd give it a try. I plan to run it occasionally just to see if it ever does find any malware.