Against armor? Doubtful, it would have much effect on a T-72, T-80, T-90 variant. I'm thinking more soft targets such as used in the last 2 wars with the 20mm Vulcan in current aircraft.
Yes, it has some serious survivability issues but again, it would have been useful in the last two wars were there wasn't a high ADA threat...after the initial stages.
Of course I posted this as mostly a joke. It could never replace an A-10 in a high intensity, high ADA threat, heavy armor battlefield. Now, the OA-X requirement? Something like this would be a good fit.