I initially gave this review 1 star. I looked over the clean base but found a clog in a place I hadn't noticed at first. Because of this, these bags turned out not to work as others have stated. It will repeat three times and then give an error. By analyzing a clean base I was able to find a blockage. Once removed, these bags worked just as well as the Roomba bags.TL:DR = They work. I was wrong.