Yeh those really are not very good, not worth the money, there is a unit called the vapureyes, the one I eventually got, that uses heat and it is in a similar price range to the poorer, convection vaporizers.

I HIGHLY recommend the vapureyes, Vaporizing gives nearly all weed a sativa sort of high, more energetic and less "mongy" or stoney.
jonny Reviewed by jonny on . conduction versus convection vaporizers? Hey all, after doing an hour or two of research i found a pretty basic but nicely working vaporizer which i purchased for about a hundred bucks, shortly afterwards i realized most vaporizors on the market use hot air and the one i bought is the old style conduction (it sits on a hot bowl, made hot by contact, not hot air). But i have heard some pretty good things about the one i bought, from a friend. So do you think it's worth it to cancel the order and get a different (and more expensive) Rating: 5