I use this plugin on ALL of the 20+ websites I manage for clients. I have had no security breaches or compatibility issues with it in the year+ that I’ve been using it.

It takes care of spam, too. Very well.

I also use their iControlWP plugin for website management and their WorpDrive service for backups; these 3 plugins make my job as a website developer — which in my book means maintenance, backups and security too — SO much easier, even pleasant.

They are proactive in updating all these plugins with new updates and features. When there are security scares for WP sites, I always get an email from this co. with thorough information in regards to the plugin and the scare and what, if any, action I need to take.

The only thing I wish it had was a little more documentation in layman’s terms, since I’m a graphic designer and not a programmer. But, I’ve contacted them maybe a dozen times with questions and they get back to me right away, sometimes even when I think they should be sleeping in their timezone!

I have set the plugin to update itself because I have no worries that they are thorough in their development and if there’s a glitch, they’ll be on it right away.