Yes and no. For a full grown chicken one will easily kill these large worms while picking it up and swallowing it. But for a chicken less than 15 weeks it can possibly pose a threat. As you may no these guys are big, I used to breed them to feed my reptiles. Though it isn't true one can chew through a lizards/birds stomach they can certainly do some damage. Cling to the throat, bite, cut, etc.. If your going to feed them to chicks crush their heads.
About raising them, once you get a good colony and cycle going they are easy. But for someone who just wants to mix up your chicken's diet with a few worms, it's not worth it IMO. Mealworms are much easier, more prolific, smaller, and less gross for squemish people. With superworms you have to keep them warm, they need space, and you have to seperate each worm when it reaches a certain size in a small dark chamber, like a film container. Not to mention they develop much slower then mealies.
