It makes sewing a large number of blocks so much easier! Today I made 48 of these:
in about 2.5 hours chain piecing.
On the left if a pile to be sewn together, behind the machine the pile already done! Chain piece the lot, cut the threads between and voila! 48 Disappearing 9 patch blocks which are currently being sewn together to form the back of Luke's frog quilt! If you click on that link, you will realise I finished the top over 12 months ago. My poor boy - he has been so patient. I promise no other sewing until this is finished!