Yes I'd used it. Survival is paramount.
Against an unarmed man, probably not, unless the aggressor had an obvious advantage that I needed to counter, size, strength, numbers, skill.
On the other hand, I'm a Guntaholic, so I have a LOT of non-lethal options available to me. It allows me to pound an attacker, without sending them to the hospital, and still have lethal force options. That makes it a little easier to immediately use a tool regardless of the situation. You don't have to make a split second decision, whether to draw a weapon or not, you just "grab and go".
The legal consequences of using non-lethal techniques, with a tool, against an unarmed aggressor....... that I'm willing to risk.