Summary: I like this OEM portafilter because it gives you the ability to switch to larger filter baskets. I'm currently using a VST 15g ridged filter basket, and am looking into the 20g. The portafilter creates a good seal with the group head, and does not appear to leak.
Summary: This made a huge difference for me. It is a helpful tool to diagnose the uniformity of your puck. Also, it is important to note that it comes with a different basket than the double-spout portafilter that ships with the Silvia (22 grams vs. 18 grams).