It works beautifully - like I said, it's a little extra work, so if it's a small quilt, I wouldn't bother. But I seem to have forgotten how to make anything less than super-king size, lately, so it's really come in handy.
I serge around the edges of the center part of the quilt, measure through the center and apply backing of that length to the sides. Then I measure crossways through the center and apply backing strips of that measurement to the top and bottom. Then I apply the topside borders - the next one I'm doing, I think I'm going to be making mitered corners -
that's going to be the challenge for me. After the backing and borders are on, I apply the batt inside - this is one of the places I especially love fusible batts.