Great device. Worth your money. The disadvantages are not significant. Has some pros Bought a third one as a gift. Everywhere looks great. Quiet, easy to maintain. On an area of 260 sq. M. shows up great. Saves a lot of time on cleaning. The apartment is much less dusty. Got cons: Sometimes it gets dull for a while when something has changed in the room and the card cannot be reset. He does not like mirrors to the floor and does not correctly build a room map based on them. Could better identify carpets he can't drive over.