I absolutely love this Premier Pet™ 60 oz. Pet Fountain and so do my animals. My cats are super picky about water that has been sitting for too long, so having this fountain which offers a constant flow of water completely changed the game. It does have a bit of a hum, which sounds much like an old refrigerator, but it was not obnoxious and eventually just became like white noise to me. It did take a few days to get everyone on board with the new fountain, but all the kitties are loving it now. I do wish the upper bowl was bit deeper, but that's just my preference. I will note, we do have large dogs (70lbs) as well, and they make an absolute mess out of the dish since it is not designed for large animals. I ended up putting the fountain in our laundry room with the cat food because the dogs don't have access to that area and put out a standard water bowl for them to continue using.