The Stalker is far more powerful than either of the other two. By powerful I mean it has much greater range. The other two work fairly well if you are right behind the catcher. The further back you move, the more misreads and non-reads you get. This is not an issue with the Stalker.
In the two videos, the Pocket Radar and the Bushnell are both at or beyond the fringe of their range. The Stalker would work well from another 100 feet back.