Ive met a few Mormons and even been to their church.
One of the first lessons they will give you they will talk about Joseph Smith and ask you to receive him as youre prophet and to pray that the Holy Spirit leads you to that conclusion.
If you go to their church you will be put in a class for non mormons and be taught their beleifs. I once had a girl friend who told me about her former boy friend who was a mormon. She told me they have two priesthoods the Aronic and the moronic priesthood. She told me how proud her former boyfriend was that he was to be a moronic priest.
Mormon missionarys sometimes go to Churches of other denominations to try to get converts, while I havent experianced that, my Dad is an SDA elder and he told me they went to his church.
They dont seem to be as extreme as the JWs