I'll give you a solid four. If I came without a marriage, I would put 5. On the problem of marriage - inside the vacuum cleaner the sensor connector came off and on the sensor itself there was dust on the optical pair inside. It took me 2 hours to repair. A lot of time was spent on disassembly and reassembly. Has some pros Wipes the floors It radically changes the concept of cleaning in the apartment It's been clear for a few days now. Doesn't require any hard work. You just need to walk and rearrange things from place to place Got cons: Came defective. Rides half a meter and stops (obstacle sensor error)