Clear 5 stars for the price. We call it our "dumb smart vacuum cleaner". It doesn't know where it is, doesn't map your house, and doesn't start by itself, but it does keep me from sweeping/vacuuming the hardwood floors every few days. I have two cats and their fur can be an unsightly mess on my dark hardwoods. This thing was a real find. She wanders around the house bumping into everything and picking up pretty much everything under her while the battery lasts and battery life seems pretty good. I only have a month but it seems like it will take at least an hour although I haven't really timed it. Not super loud, but not quiet either. I also wouldn't recommend leaving it alone unless there are obstacles in your house. Mine likes to hang on the high carpet in our living room. This little vacuum seems to have a lot of caveats, but for less than $100, it's been one of my most rewarding Revain purchases to date. He really collects a lot of things. If you don't want to invest big bucks in one of the most well-known smart vacuum brands, I don't see how you can go wrong with this one. One note: I know some are hesitant due to the fall protection sensor. and how he handles dark wood floors. My hardwoods are dark hazel and I've had no problems. I will add photos of the floors for reference.