I've had other robot vacuums before, but this one is the best I have had so far. Others I have had in the past always seemed to just wander around aimlessly until they ran low on battery. Once I mapped the house, this vacuum will go to each room and clean it. It cleans the hallways, bedrooms, kitchen and bathroom. Then it returns to it's base regardless of the power it has left. Not only that, but it is quieter than the ones I had before and cleans better too. The best part to me though is that it's sensors are much better too. In the past, I have constantly had other vacuums get stuck in places. I'd move it away and it would go right back or I'd listen to it bang against something over and over trying to 'figure out' how to get out. This unit may get stuck once a week. The only time I really have to do anything with this unit is to empty it.