If he shows agression to his current hens, or to you. Your husband is a different issue. Most birds will test out women first. Part of this is behavior. If he wing dances for you that's not necessarily a problem but it could become one if he tries to "herd" you and you don't go as directed.
If...
Those questions are hard to answer because every rooster is an individual.
Have you had the opportunity to watch him at his current home? Or interact with him yourselves?
The first few weeks are going to be hard for everyone involved. He's been roosternapped (thanks to @Shadrach for that...