It helps and teaches.

The thing I like best about this plugin is that, in addition to actually cleaning a site and making it more secure, is that I actually learned a great deal about how to better install WordPress in regards to security. Plugins that both provide a function and teach you to be better at what you do aren’t as common as you’d think.

My only gripe is that the default notification settings are way too sensitive and unless you deactivate them, you get WAY too many emails.