Within the month, citizens will be able to purchase and carry the X26C, which is only slightly larger than a cell phone, for carry without a permit in 43 states, because it is (technically) not a firearm.
Here's the best part: You can drop the TASER and run while the perp is trying to regain control of his muscles. If you file a police report, TASER will replace your X26C at no charge.
If you ask ACE:
Personally, I'm more confident using a small 5-shot revolver in 38 Special or 357 mag, but that requires a CCW license which not everybody has, and can subject one to lots of questions by the police and a likely expensive, drawn out civil suit by the perp (if he lives) or his relatives. Using the TASER only momentarily immobilizes the perp, giving you time to escape, without doing him any permanent harm in MOST cases. If you're not mentally prepared to ventilate a bad guy just because he's asking for your purse/wallet and watch/jewelry, this is the defensive device for you.
Remember, if you're in a risky situation alone, don't allow strangers to get into your space (7-10 feet), even if they appear friendly. Warn them not to, and have your hand on your defensive device in case they do.
SAFETY ADVISORY: Since there have been cases of deaths following a TASER hit to those with pre-existing medical conditions or high on drugs [see TASER's medical page]; it is highly recommended that those people not threaten the safety of others who might have a TASER (or worse yet, a real gun that projects small pieces of hot lead at high velocities).