It's somewhat like aegislash. It requires a lot of prediction, and if you do it wrong, aegis is dead. If you do it right, aegis destroys a few pokemon. You gotta know when to switch out, when to attack, etc. Play poorly and you'll find yourself with a dead Banette, play well and you end up with 2-3 dead pokemon. It's because of Babette's reputation of priority destiny bond that allows this set to be useful, because they expect that, and attempt to toxic stall, or set up. You can take off their life orb or leftovers when they set up or toxic stall, making them a lot less useful. Then you switch in to the appropriate pokemon, or proceed to finish off that pokemon, depending on how much damage you did.