There was another thread on this topic that kind of petered out, but it seemed like at the time there currently was no such thing as a corded/cordless vac. The problem with cordless is battery life and the lack of a separate charger to charge the battery (assuming you have two batteries), so when the battery runs down you have to stop working and charge it.
Is there a cordless vac that can also be run while plugged in? If not, does anyone know why not?