i had tried to use it for my sons quilt thinking it would save me from some smelly, messy spray basting. it did not stick well at all and i ended up having to pin.
i kept hearing such mixed experiences with it so i decided to try again. the first quilt that did not stick was made with unwashed precut fabrics. future projects have been smaller but have all been done with pre-washed fabrics and have stayed together well enough to be quilted. not as good as my spray but pretty good and all of them have left no sign of any stiffness or smell from the fusible after being washed.
i would not use it on a full sized quilt without a few pins. just in case.