To understand why; you should know that, at home, I have a hallway, a living room and a kitchen that have no doors. The problem is that the robot can get lost in the corridor after 5 to 10 minutes and remain there until the end of the cycle ... What makes the bottom of my hallway is clean, but not the rest ... In addition, the robot takes very easily in furniture legs, to get stuck almost indefinitely ... ...
In addition, the soil is not super clean after (it takes longer see it as a daily maintenance, in addition to a large weekly cleaning on weekends). And you have to buy wipes that are going on. Daily Care Consumables + = such a good deal more than that ...
Overall, I do not recommend.