How does this portable unit compare to some of the more popular wall or AC powered units?
The size of the tobacco chamber is smaller, and therefore needs to be refilled more often. The Volcano, for example, uses about 200 Watts of energy. This much energy is simply not available in a battery powered unit, therefore the heating chamber needs to be smaller. The wall-powered bag-filling units are designed for aromatherapy for large groups of people, while this vaporizer is designed more as an individual vaporizer, for one person to use at a time.