For civilian use I would not go with the Taser or any type of 'stun gun'. IMO the Taser is practical for LE/security but not for self defense. The problem with those devices is that they don't work like they do in the movies. The stun guns will stun somebody at contact range, but not knock them out. The Taser will drop somebody but as soon as the juice is turned off the BG is back in the fight. Also, the Taser is good for ONE BG only hence it is not effective against multiple attackers.
If you're allowed to carry firearms, do it. If not, carry a knife and/or an ASP defender spray. The ASP defender spray could also be used as an impact weapon after you hose em down.
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