Very happy with my purchase. This robot is really smart. Connected to its base in a room of the apartment, it goes into the hallway and into the rooms starting from this corridor. Some tests with some salt sprinkled lawn confirmed that really going anywhere. One little less, unlike a conventional vacuum cleaner, there is no separation of dust from the air filter before (in a conventional vacuum cleaner, we would have a bag or a cyclone). Inevitably, it explains why it is recommended to change the filter every 2 months but also the price of compactness.