The perp conveniently grabs you above the waist and below the neck and, best case, gets shocked. Depending on the surroundings, he recovers sufficiently before you manage to escape. Enraged, he knocks you down (your head, neck and legs are unprotected). Now, aren't you glad you're wearing your hands-off magic jacket, while lying on the ground?
Terrible idea for women's self-defense. By design, it's passive: doesn't do anything until you are already attacked. And what's with the activation (photos 5 and 6)? Yeah, just what you need in the heat of the moment.
Much better to educate yourself, practice with and carry quality OC pepper spray. (Not Mace!) Works on dogs, too.