I had accumulated quite a bit of Coats and Clark over the years sewing that is still good but my machine doesn't like it very well - shreds and breaks - but works fine for the bobbin. I've been taking and filling bobbins with that and using it up. I have never seemed to have issues with getting a good 1/4" seam and everything fits together just fine so I go with it. Most any color will work for me since you don't see it anyway. When that thread gets used up I'll probably be more picky.