I'm going to be the outlier here. I've not been impressed with the way Aurafil comes off the "mini" cones on my machine--too much breakage. I instead use SoFine #50 when I have a cone that doesn't have enough to bother to wind a bobbin with, same with Bottomline if I really want fine stitches. I like Presencia although pricey. So mostly I use Mettler for piecing.