My husband purchased a Braun coffee filter over 7 years ago and I turned my nose up at it thinking that the coffee would not taste as fresh as using a regular paper coffee filter each time. Boy was I wrong. Not only does it taste just as good, but this filter can be washed out (even in the dishwasher) and I no longer have to worry about running out of filters. My daughter took our old one as we switched coffee makers and had to get a new one, which is the F4 size. I love their convenience and thriftworthiness.