All I can say is try it out for yourself. I've heard that line before and I have to wonder at their motives for saying that. I happen to like mine for home defence and for anti-carjacking protection.
That would surly deter any creetan from try to take you car
Now I will begin to get ammo for it and I have my eye on a 9mm carbine so I will begin to get ammo for it while I'm saving up for the carbine.
After checking around ammo is getting very hard to find. So I would strongly suggest everyone to buy it when you can.