I studied with the Mormons for a year, and some of my extended family are Mormons and seem happy. I know that they have some beliefs which are very strange, but they are not so hardline as the JW's. Much more is left to their conscience or 'free will' and they treasure families and will take almost any steps necessary to keep a family together.
I couldn't get past some of the teachings, and being a hardline Starbucks fan, I'd have never made it...
I don't believe them or their leadership to be a threat like the witnesses are. There is more room for individuality and more respect for women.
J