Thank you everyone for your nice comments! I love making these. They really arent' that hard. I do end up having to fuss with the seams a bit as I end up tightening the seams toward the center some times to get it to lay flat.
As to the center I usually make a flat yoyo and top stitch it on the center.
I won't be making a quilt with these they will be going into my online store.