My Bernina 440 is my main machine and I also have the embroidery for it. If I want to sew when the embroidery unit is attached, I usually just get out my featherweight to piece on. It's not any kind of hassle to attach/remove, just disconnect the cable and lift away, but it takes a couple of minutes to also change the pressure foot, bobbin, ect. If I have more embroidery to do I usually just use a different machine.