This is a MUST HAVE security feature for anyone operating a Joomla site, especially one with lots of traffic and community users. It helps me sleep at night. With this module you can choose a secret keyword (of any complexity) to change the location of your Admin page:
www.mysite.com/administrator/?mysecretkeyword
Up until now, I always had to worry about someone easily locating the default Admin page. Now I sleep easy knowing that I have made it even harder for any would-be hacker to mess with my site.
I like that you can set the "404 Error" page to either a custom 404 page or redirect the hacker directly to the front page of your site.
My advice for anyone using this is to always use an ALPHANUMERIC keyword combination and change that keyword periodically. Don't end up in the forums saying "My site was hacked!"
And make sure to write down your keyword! You won't get back into your admin screen without it!