I mostly hand-quilt-I use Gutermann's-having said that, I recently bought Coats & Clarks-it was 50% off and had just the right color for a quilt i'm doing, and I HATE it!! It starts to frey about 1/2 way down the piece. I have changed needles and tried knotting it the other direction, but nothing is helping. I am using the same needles I always do (John James) and the batting I have used numerous times, and it has never happened with my Gutermann's. Guess this is the last quilt I will use C & C's hand-quilting thread! I also like Aurofil and Gutermann's for machine piecing, and hand-sewing. I LOVE silk thread for invisible applique by hand, and will use my CC's for mostly basting.