I can tell you from experience that daring hackers to hack your website is not a good idea. It simply never is no matter how secure your system is. However, the Hack me if you can plugin does have some potential. It is designed to protect the admin page of your website. You can not only define a new admin path but also leave a text for hackers.
Should you use this plugin? I am torn on this. There are better ways to hide your admin and protect your pages by IP is certainly effective. Leaving hackers a message is certainly not a good idea, so you should not try that feature. This plugin could prove useful if you don’t want to mess with your server settings or .htaccess files.