I think it worked fairly well for what I was doing.
I used it to line the inside of this toiletry bag I was making for my man. (I used this and this tutorial for the bag.) I think it could have stuck a bit better to the fabric, but I am not sure it matters so much after it is all sewn up. Perhaps next time- especially if it is an outer fabric as opposed to a lining, I'll try this iron-on vinyl?