Knitting: The Lifeline

Have you ever used a lifeline (auxiliary thread) when knitting? I like to use one especially with lace patterns, because knitting back to fix mistakes is sometimes quite difficult and this way I can unravel without having to worry about lost stitches. What do you think?

photo: Lifeline

from Instagram: https://www.instagram.com/p/CN9m0urh3m1/