The biggest I've quilted on my domestic sewing machine is a twin. It turned out nice but I have a Christmas tablecloth I want to quilt and I think I'm going to try quilting the two sections and then joining the batting with a zigzag and then hand stitching the backing together. If this works well, I'm going to use this method to try a queensize quilt. I have hand quilted a couple of quilts and I do enjoy it but it takes me so looooog that I get bored. As for purchasing a mid or long arm, not in my budget yet.