Jehovas Witnesses, good or bad?

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I always like the way that Jehovas Witnesses dress, they look so clean cut and good natured that they make you trust them. And they know so much about the Bible. I've been visited by many on several ocassions and I've even attended their meetings a couple of times but there are so many bad rumors about them that it gets you thinking on whether you should trust them or not. What do you guys think about them? Thank in advance for your responses!