Each day your WordPress website meets hundreds(may be thousands) wp-admin attacks from bots all over the world.(You can make sure about this with log monitoring in your web hosting) They try randomly find your login details and get admin access. Without any configuration, with one single click WP Guaven FP prevents your websites from all of those attacks. And this is only one of 9 features of WP Guaven FP.
Demo: http://codecanyon.net/item/guaven-fp-protect-wpadmin-hide-wp-theme-name/4812947