Brilliant gadget. It's a good investment. There aren't any major drawbacks to this. The pluses: As a present, I decided to purchase a third. This whole place is stunning. Calm and simple to care for. Appear fantastic on a floor space of 260 square meters. Great time saver in the cleaning department. There is noticeably less dust in the unit. Distinct drawbacks: When the card cannot be reset because the environment has changed, the situation can become tedious for a while. He has a problem with floor-level mirrors and cannot use them to accurately reconstruct a space's layout. Might be able to spot carpets that are too soft for his car.