With the change to Interceptor/Skyfire, it's better against flying vehicles only. The Quad Gun is better versus FMC's, but still won't kill one. I'm not sold on it against flyers either. It's got a greater chance to penetrate, but it's still only a 1/6 chance - the Quad Gun at least has a chance of hull point stripping.
If you're needing antiair though - get yourself some of your own flyers, either allied in or otherwise, or take some Tau allies.
100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3