My husband and I AND our son all see the same therapist. He is well-versed in family dynamics/therapy, and his insights into us as a family unit have been very helpful.

What you have to be aware of is if you are the type of person who can "share" that therapist, or are you possessive of your therapist as only yours. If you are possessive, probably not a god idea.

I know people worry that the therapist will breach confidentiality in such an arrangement. We've never had that problem. Our T made that very clear from the beginning that he always holds what we say in confidence unless one of us is in danger. Confidentiality is obviously a conversation you must have.