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My cats get all dramatic every time the thing gets near. Like its the first time they've seen it. I know one of the cats is a dummy... not sure about the other. The newer ones are supposed to do a better job of not getting caught on cords, too. I'm liking the 550 quite a bit. I can't imagine how nice the $700 one is. They were going to make one with a cam you could steer remotely via Wifi, but that project never got off the ground.