What I agree with is that they come in Jesus name (just as Jesus declared they would do, saying "in your name", "in your name", "in your name") who I would count as false brethren because as Jesus stated they must depart from him for they work iniquity.
And yes I am aware of Jewish exorcists trying to cast out evil spirits using Jesus name (who Paul preaches) there but I don't really see them doing that.
The evil spirit does not even know them
Acts 19:15 And the evil spirit answered and said, Jesus I know, and Paul I know; but who are ye?
Acts 19:16 And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded.
It seems more like the evil spirit drove them out of the house rather then them driving out any devils there.
The name of the Lord Jesus was magnified through their own failure to do so
Acts 19:15 And the evil spirit answered and said, Jesus I know...
Same here...
Mark 5:7 And cried with a loud voice, and said, What have I to do with thee, Jesus, thou Son of the most high God?
The one possessed with the devil, that reccognized Jesus was in the end of the experience sitting, and clothed, and in his right mind, praying Jesus that he might be with him.
Not so here where the evil spirit did not know the one calling over Jesus name
Acts 19:6 And the man in whom the evil spirit was leaped on them, and overcame them, and prevailed against them, so that they fled out of that house naked and wounded.
Although in both pictures the people that witnessed or heard of both were all afraid, regardless.