I cant imagine the Herb Iron giving hits that are as consistent as the Supreme. I would guess it is like the SSV which needs you to inhale a certain way to get consistent vapor. See the Supreme gives you rips that are so thick that you don't miss smoking and you can hit soft are hard and it will yeild the same results. One of the best things about Supreme's are their reliability, the VHW gives good rips also but it is much more fragile and they can have problems, the Supreme can be tossed in a drawer and you could pick it up a year later and it would be the same great vape. Plus it works without any attachments by direct draw, whip, and you can use it with waterpipes without any attachments.