I don't get too excited when they come around. They mostly know what their church teaches. That's why they had to write their own bible. One day, the JW's decided to fix the KJV so they literally handed out black felt pens and had people cross out what they didn't like. True story. That's how themJW bible came to be. I forget what they call it now.
So I always tell them for every book or article they give me to read, I will give them one of what I have. After a week or so they can come back and we can talk about what we read. Not one has ever taken me up on it.