I honestly can't believe Baratza makes this... This is by far the worse product I've ever purchased. The design is bad, the portfilter essentially falls through the oval shape unless you hold it the entire time. The retention clip is terrible as you need to tilt the portafilter to insert it, as well as when you take it out as well, causing grounds to be lost. Despite using an RDT spray, you lose out on a ton of grounds. Using a dosing funnel also doesn't work with this. DO NOT BUY. just buy a 20$ 3d printed holder for the esp instead.