The bottomless portafilter brings a number of advantages besides being a perfect diagnosis tool. One of the advantages is that your espresso produces more crema, because your espresso simply ends up in your cup without being in contact with the bottom of a regular portafilter. More crema means more flavor at the same time. We all know how quickly the inside of a portafilter can get dirty, with a naked portafilter the taste of your coffee is never affected. This way you retain the pure taste of your coffee beans.