I've been considering something like one of these as a car gun. Perfect for urban riot situations when the li'l old 9mm just isn't quite enough. I have a Concealed Handgun License, and these are legally considered to be handguns.
Got one of these - love it - have a laser sight on mine. My brother in law just got me a 75 round drum magazine - looks great on the pistol
That one uses the 5.45x39, right? I would check on ammo availability in your area before deciding.