I've had a few and they're so much better than a real vacuum! Certain features are necessary, deal breakers. Having a smartphone app is a must. You can choose areas to vacuum, you can set a schedule, and you can also see where's she's been - or not. Virtual boundaries are totally a must. You don't want to have manually block areas where you don't want her to go. Some vacs have strips to put down but one, there may not be enough, and two, again that's manual labor. Also, you want it to resume cleaning if your house is too big for 'one swell foop.' You want her to go home and charge and then pick up from where she left off. Mine also has a mop feature, which isn't great, but at least better than me not mopping!
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