We bought the First Years Clean Air Diaper Disposal System because we wanted something that we didn't have to buy special bags for. Even though you do have to buy replacement filters and replace the batteries I feel that we have still come out farther ahead on saving money because we don't have to buy special bags. Obviously, when using smaller diapers such as newborn and size 1, it holds a lot more diapers than it would holding size 5 & 6 diapers. It's easy to "forget" to change the bag when using smaller diapers because it takes longer to fill up. We haven't had a "stink" problem. If there is a stink problem it's probably because the bag needs to be changed out more frequently. We've only had a stink problem if we didn't change the bag out in time or neglected to replace the filter or batteries. It closes tightly which is what you want to keep the stink out, but it is a little noisy when you close the lid I Would definitely recommend this product and thinking of buying a second.