Very good, but not perfect, unless the paid version is better

Has saved me a few times now as it has detected and removed malware and various problems that have infested my site. But there was one time when it failed, it didn’t detect the Malware that Sucuri site scanner said was on my site and I had to use the Anti-Malware Security and Brute-Force Firewall plugin, which did the job.

In general very good, perhaps the paid version would be even better (as noted, I have the free version only).