Mono thread has come a long ways since the 60's! Back then it was like fishing line... Stiff & pokey and over time wore out, split, melted if laundered.... There are some very good monofilament threads on the market now, soft, strong, pliable, holds up to wear & tear... The one from Superior Threads is my favorite so far for ease of use and durability. I quilted one of my son's quilts with it 9 years ago and that quilt has been (used &abused!) The quilt has needed some repairs the quilting thread has held up fine