Using the Decent Espresso portafilter stand and funnel you can now have your coffee grounds go directly into the center of your portafilter. This makes for faster puck preparation, as well as better espressos, because the grinds distribution is now centered.
If you instead use the dosing cup, your workflow is slower but your espresso will be less good as well, because the grinds will be lopsided in their distribution in the portafilter basket.