http://youtu.be/jZpj4zG5tEo -- In game demonstration
http://youtu.be/-_eCWDwGdYc -- Real life demo. Hard to see but the sudden lurch when they open fire is way more than I expected.
http://www.armytimes.com/article/20080720/NEWS/807200334/-8216-Neither-us-expected-get-out-alive- -- This is a good article about a single AH-6 taking on 5-6 anti-air trucks in iraq. Gives an idea of the *potential effectiveness*.