I used to have a brace of those! My God, how I do miss them. I felt sooo much safer. I knew at MINIMUM they would alert me and keep a bad guy busy long enough for me to steady myself. What a luxury to have.
Lost my last one a year ago next week. 13 1/2 years old he was - very well aged for the breed. *sigh*
I have not felt safe one day since then, no matter what I have at my disposal. Reminds me that I need to go practice A LOT.