I've used wool or poly(med loft)over Hobbs 80/20 when I want significant relief to show the texture of the quilting and find it works well and I like the look. I also quilt on a long arm which makes it easier to do. I does make the quilt heavier. I also use it when doing an embroidery block or applique block quilts where I want the applique or embroidery to really "pop". On a large wall hanging done for a competitive show, I used double med.loft poly on a wholecloth to avoid the worry about creasing. But generally do not like poly for bed quilts.