they sew through just about any fabric unlike the new machines. i was making potholders, 2 pieces of fabric, 2 pieces of batting and 1 layer of insul-brite. i got so many skipped stitches with my brother computerized machine. i wouldn't dare try to sew layers of denim with it. i was a garment sewer now turned quilter so i always wanted a sturdier, workhorse machine.
i personally like the all metal machines because to me they are sturdier plus you cannot beat the classic look of a vintage singer machine. to know that some have been around approximately 100 years and still sewing! oh my!!!!