I have not used my serger for piecing a quilt, but I have used it for the edge before putting on the binding. I did it on a baby quilt and it finished really nice. I do not think that I would do this to a full size quilt. I have been told that you cannot quilt a serged quilt, but I have done it in the past. Yes the seam is a little thick, but it was not an issue for my machine.