I'm a hand piecer for the most part, and I use 50 or 40 wt Mettler, according to color. My sewing isn't consistently fine and tight enough to prevent some seam thread showing, so I always color match to one of my pieces. I have done some machine piecing on my old Huskystar 224 and I use the 50 wt for that. I have some Aurafil, too, I just haven't broken into it yet. It was on sale.
