Pro's and Con's of Motorized Robot Carts

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Just wondering what teams have one and what everyone thinks of them. Even after 4 years of FRC in Michigan, I've yet to see any motorized carts. Is this different in other states? We've always had one and have never had any problems with it. Next year we'll be unveiling a new one with even greater maneuverability.

Edit: This is meant to get the word out that they are not bad and if done right can make a team more efficient while not making any volunteers unhappy.