Just wanted to say that I bought the 50wt as well - several cones, because I had heard such great things about it. When I tug on it, it does break sometimes. I don't machine quilt with it anymore because when I bury the knots, sometimes the thread snaps and then I'm stuck (and mad). I only piece with it and so far, haven't had a problem with seams coming loose. There is no way the thread is old.