I believe that's all they are good for... An extra peice of mind, i have walked bare legged into a nearly dead one before
Hurt like hell, my dog walked into it as well seeing as he was beside me. He just took a few steps back and then jumped over it. If it were fully charged I'm sure the outcome would of been different. I wouldn't buy one, however i also would be alright with using one if someone else brought it into the bush.