Have been through it... Is not easy for DID. Tho likely the "best", it has to be done carefully by a trauma therapist who really understands DID. Cannot be used on all alters. Can sometimes put them further into trance state or dissociation. Is not one size fits all.
Many t 's now agree that integration isn't the therapy goal any more, but more of a cohesive working together with everyone on the same page toward the same goals