Quilting DD and I both bought the mesh thing in Birmingham last year. We saw a demonstration earlier and it seemed a very handy addition to the notion department.
When quilting the Midnight quilt, I finally came round using it.
Next, put the mesh on your quilt where you want the design. Ah...don't use a black marker when the area is black fabric!
I'm not very enthusiastic about it and I don't think it's worth the cost. You better use a piece of cheap tule which does the trick as well....