I am very pleased with this security plugin. It has all the bells and whistle that you expect from a security plugin. The good part about this plugin is that it combines security with a firewall. I am currently testing it with WordPress 3.6 beta 4 and it runs without any errors.
Currently tested on WordPress 3.8 and 3.9 Alpha and it is working very well. 19-12-2013
I can see that it has not been out that long but already becoming very popular and the downloads are starting to increase. This will definitely become a must install plugin with your website from day one.
I want to thank the developers for sharing with us this superb plugin. Keep up the great work and I know your plugin is going to become very popular, soon.