I bought a 12v car vac (i.e. powered via cigarette lighter) a few years back and eventually ditched it because the suction was poor. Now I'm looking at them again because my car is always a mess and it's a hassle to use our mains-operated vacuum cleaner (running power cable though lounge window via extension lead). Does anyone have a 12v device they're very happy with and would recommend? Or are they just all limited by their power source?