I have several brands. I have some Maxi-lock swirls left from when I quilted on the mega quilter. It works well for me, but I have heard people say they can't or won't use it. I am on a fixed income so if I have to purchase it, I can't spend very much. I bought one spool of Essential Pro, but I haven't used it yet. The expensive threads like King Tut are wonderful, but there is just no way I have enough money to purchase them. Ebay is a good place to look. I have never used Coats and Clark.