So, I bought a 58MM naked bottomless portafilter setup for my KitchenAid. Decided to give it a whirl. Well, I'll be darned if that thing did not pull the best shot it's EVER pulled regardless of type of coffee. And for the record it was with the Kirkland Espresso Blend. And like the Casabrews, it put on a nice head of crema (best it's ever done not using a pressurized basket). Funny thing is the portafilter I bought, is a Casabrews brand. Go figure
Anyway thanks to these portafilter sets I am more impressed than ever with both machines