I use Superior Threads for all of my piecing work, and I love it. I use the Masterpiece 3-ply, 50# weight. It's very thin and strong, and I've never had a quilt "pop a seam", or anything like that. I also use King Tut for all of my quilting needs, and it's awesome! Nothing could make me change; I've tried every thread on the market, and these are my choices for quilt-making.