Rockets. Rockets of rape.
On small maps this ability is destructive as shit. On larger maps it has a pretty lengthy call in timer. So you gotta Button a heavy tank or get a really good distraction off.
Definitely powerful when it hits though. The direction the strafe comes in from can be finicky sometimes. I think it's the reverse of the American Strafe/bombing run so keep that in mind when deciding direction.
AFAIK american strafe comes in from the edge furthest from the strafing area.