We have one, but I found it to be a huge waste. We turned it to knot off the last nappy, as directed, but when we take the bag out, it all unravels and leaves a tonne of bag that's just wasted. I can't warrant doing that, so we just throw them in and tie the bag up when it's full. I have to say that it doesn't really smell. We are on the 4th cassette and Oliver is 6 months old.