The original Angelcare cassettes can also be filled, but more difficult, because there is only a small gap through which you have to push the sheet clean. The Smellfree refill cartridges (compatible with Angelcare), however, can be a part of fold up and they fill super luxurious with the film. It's quick and easy, I ask what round topsy-have in a few minutes a cassette full.
The film itself feels thinner than at the Smellfree tapes, but works fine, because nothing smells. And price is unbeatable. We are so long filled the last three Smellfree cassettes so until the Sohnemann no longer needs diapers. : D