The volcanoe is supposed to be the shit you guys are all correct. I just picked up a vaporizer from www.vapolution.com and it is badass! most other vaporizers use these following types:

1. conduction (metal on weed usually) for heating
2. convection (heating up the air or object around the weed) more efficient
as it does not let the weed actually touch the direct heat source.

The vapolution uses the convection method and not only that but the bowl and the heating element are glass so it is a glass on glass feel with no loss in weed taste.