They have their own twisted and distorted version of The Bible (that was translated by 4 men that were not qualified to translate) and will be the nicest, humblest, and caring individuals you will ever meet. Until you show them, or mention the fallacies, and outright lies that The Watchtower Society has inserted in their "bible" and literature. Also.....once they have suckered someone into joining all bets are off. You are expected to be 100% compliant in following their rules and are highly "encouraged" to not associate with "worldly" (non JWs) people including family.
A member's main purpose it's too walk door to door distributing their literature and to convert others so they can by added to the pool of free labor that's true purpose is to keep the publishing company (The Watchtower) relevant. They are also highly "encouraged" to work as little as possible in order to have more time to "preach" and are expected to attend two (used to be three and before that more) "meetings" per week which essentially serves as a way to keep the drones connected to the mother ship.
Here's where it gets complicated. They have a long list of infractions (most of which agent biblical) that can get someone disfellowshipped and when that happens the rest or no longer alloud to speak or associate with them. Remember when I said that they are supposed to only associate with JWs? Well, by complying they eventually are in a position where most, or all, of the people they associate or JWs. When they start to have doubts or actually see the Watchtower for what it really is, a Publishing Company/Cult Leaders that has a continuing history of teaching false doctrine and prophecies, that are stuck in quite the rock and a hard place. Speak out or get out and be shunned by friends and family. Or keep quiet and give lip service to their cause in order not to lose everyone that is dear to them.
Their list of infractions is a whole other topic by itself but what I must mention is that their whole doctrine is dependent on end times prophecies that arent even in the bible. To refute that doctrine as a JW is grounds for disfellowship. And everytime a prophecy doesn't pan out, or other beliefs are proven wrong, they dismiss it by claiming they The Watchtower) saw "A new Light".
It's all a sad affair and it's damn near impossible to deprogram a JW or get them to leave even if they are convinced its all wrong. Some of these other cults share strikingly similar characteristics as the JWs. I just know allot more about JWs because I have personal experience with them.