devtrackers.gg
As interesting as they look, they gotta reduce that initial delay on firing, else these units will constantly derp out whenever the enemy micros back an inch. They'll literally be unable to fire back at them.
The firebats in Wings of Liberty campaign have the same problem, where they barely ever get to fire, because units behind it kill their targets and the initial delay means by the time they start shooting at their new target, it's dead too, and then so on it goes forever.