I use the first one with my Pfaff. That and the 1/4" foot with the blade are probably the most used feet I have. Love them both. I also use the SID foot as a guide for sewing binding by moving the needle just a hair to the right. The second foot is the same as the one I have on my Brother 1500, but I don't care for it...the fabric bunches up at the tip of the blade.