A Featherweight is the ultimate piecing machine IMHO, but it doesn’t do anything but a straight stitch if you want to do other types of sewing. I took one for a number of years in my RV. It is a bit of a challenge to get perfectly matched seams between two machines, nut the FW has some aftermarket accessories that can help. I prefer the acrylic seam guide on mine. I don’t know if you would be happy with a Bernese after the 440. They just aren’t as solid a machine. The FW, though light, feels solid. Getting one a bit scratched up is much less expensive than a pristine one, but it sews just as well.