That group was sending a black woman and white guy into our neighborhood about 20 years ago, and I had a few conversations with the white guy and a black woman, very attractive, both of them, could have been models. Very intelligent, and well spoken. I was impressed with both of them and listened to their message and read their brochures. No matter their outward appearance, you could tell it was some crazy shit, rejecting holidays and celebrations, no blood transfusions, and all but rejecting Jesus as the son of God, if I recall.
I also worked with a black guy who was a JW for many years,(and still is) and I've never worked with a nicer person in my life, everyone loved him, even though he made no secret of his visits to the shrink. Not sure if any of that is connected.