I'll give you a solid four. In the event that I did not have a spouse, I would put 5. Concerning the issue of marital compatibility, the sensor connector broke off inside the vacuum cleaner, and the sensor itself had dust on the optical pair that was located within. To fix it took me a total of two hours. The process of disassembling and then reassembling took up a significant amount of time. Pros: Cleans the floors with a rag It fundamentally alters the way one thinks about keeping one's flat tidy. It has been bright and sunny for the past few days. Does not call for any strenuous effort on your part. You need only move around and reorganize items as you go from one location to another. Got cons: Came faulty. Rides half a meter and stops (obstacle sensor error)