Video like this is neat to look at, but really useless for any practical purposes. You can only shoot at game with so many shots until it dies.
Generally, if you hit it the first time, you don't have to take the next shot, and if you are like I am, it's hard enough to keep track of more than 2 downed birds, at a time.
A good old mossberg will do that for about 1/10th the price.