All of my machines run fine on Coats & Clark. I have a spool near me now that is about a year old I think. It says Coats on the side that says mercerized cotton and also says USA. The other side says Coats & Clark and the dye lot info. I agree that we all need to use what works best on our machines. I try to avoid blanket statements like "it is no good" - might be no good for some of us but it works fine for some of us too. Just my opinion.