slojim,
About three years ago, I picked up a Sigma 380 as a concealed carry gun. Most of the comments are right on here. However, I will say a couple of things in favor of the gun. First, it has a very heavy trigger pull, which I think is good for someone not entirely used to handguns. If you are ever in a situation where you need to use a gun defenseively, you don't want a nervous adreneline rush causing you to prematurely pull the trigger. Second, it is very reliable - I never had a single failure-to-fire. It is also very light, snag-free, and very concealable (which fulfills the dictum of carrying a gun - "an often-carried small gun is better than a seldom-carried large gun"). Now, on the downside, it is very cheaply made and is, for all practical purposes, a junk gun. It is also extremely inaccurate, and I would never have thought about firing it defensively at a distane of more than 3-5 yards. Finally, the 380 round is rather anemic, although with the proper load the 380 can be every bit as deadly as a 9mm. I personally sold mine this past year as a trade-in for a S&W 638.
So, in conclusion, I think you could do worse for a concealed gun. But you should shop around for a better alternative. Keep in mind that for a cocealed gun, you want something that you feel comfortable with, in addition to the features of power, accuracy, and reliability. Finally, if you buy this gun, you should offer no more than $125-150, depending on how much it has been shot.
rock jock