I haven;t tried the ones I see outlined above, so it is diifficult to say for sure..
But, in my experience, including the boxes and the hand held models, nothing compares with the Volcano.
Quick story: Seasoned Head, Iron Lungs, next door neighbor, said: "Ahhhh Vaporizers do not get me high...!" I fired up the volcano on setting 4, and he took One large hit (aided by me squeezing the bag lightly) and promptly leaned over and fell off the couch hitting his head on carpet. Looked up and said, "Whoa..>!"
It really works where others do not deliver a good stone.
But, in my experience, including the boxes and the hand held models, nothing compares with the Volcano.
Quick story: Seasoned Head, Iron Lungs, next door neighbor, said: "Ahhhh Vaporizers do not get me high...!" I fired up the volcano on setting 4, and he took One large hit (aided by me squeezing the bag lightly) and promptly leaned over and fell off the couch hitting his head on carpet. Looked up and said, "Whoa..>!"
It really works where others do not deliver a good stone.