You can find a demonstration installation here it should always be running the very latest version straight from SVN, it's not always up to date, but it should be a good demo of what the MRBS does.
There's nothing about it which is different from what you get. You can even use the admin stuff although we'd prefer it if you didn't delete too much! If you do go and delete a room or something then can you add another one back again when you're done. You can login as any of the following users, only the user "admin" has administrative rights. Additional help is available under the help link at the top of the page.