The Arizer Air Solo II is about half the size of the ArGo and has twice the battery life. It has a slightly longer heat up time but thirty seconds isn't very long to wait for a dry herb vaporizer session to start. The vapor path for the Solo is super easy to draw from and the all glass heating system maintains a great flavor and is easy to clean. The Solo uses conduction heating via a ceramic plate that contacts the glass vaporization tube. This unit comes with two mouthpieces each of which is a different length so you can choose how long of a draw you want.