It should be good on those days when they have a small nuclear fusion to light up the subject
Or the days you left the 12K price 3.2 kg 500mm f4 prime in its hard case back at the car.
One and a third stops worth of ISO is not a biggy these days.
A good lens for the amateur who just wants the reach available to get the shot.
My concern would be its super zoomyness, I would be more convinced at this stage of its quality over all its full zoom range if it was a 300-600mm.