I too have loved the Bottom Line thread for piecing--and quilting. However, it is picky, picky, picky to quilt with. I used a 100% cotton in the top, and had to adjust to get the tension right. I think Superior's Masterpiece would probably work better in the top and bottom. I've used Aurafield and like that as well. I do want to find one that I am happy with the top and bottom threads.