We went into a headshop a week before 4/20 and the store clerk absolutely sold us on the Iolite. His suggestion was to buy a drink cup from, like, McDonald's, drink your drink, and stick the vaporizer in the cup. There's virtually no noise. And if you can hold the vapor long enough, no smell.
But when we went back on 4/20, after waiting in line for at least three hours, they were sold out. The Herbalite solo is all right, but I really wish we had that Iolite.