You are more than welcome to use Metasploit - a lot of our customers didn't want to go through the trouble of setting up their own Metasploit config, etc., so we built this to give them a simple quick check.
Why bother with something this elaborate? I ran a Metasploit scan on the /24 network that my Linode is located in and turned up 4 vulnerable servers in a matter of minutes. If someone were hunting for vulnerable hosts, this form would be a really inefficient way of finding them when you consider how easy this is to discover using simple network scans.
