I've used a Silver Surfer vape for many years and love it (I have 3). I'm in my 70s and do not have many people over for getting high sessions so the SSV is best for me.. passing the SSV wand around is kinda like playing musical chairs and a PITA, so I did buy a volcano about a year ago.. I've used it twice.. unless I'm doing something really wrong, it isnt very efficient. Turned it on, let it warm up and put in a gram of A+ bud, filled the bag (volcano bag).. I think I got 5-6 hits out of that bag.. filled it again with the same herb, didnt taste as good and another 5-6 hits.. for me, alone, its a waste of time and herb.. it just sits there now.. for efficiency, the SSV rocks.. and is a couple hundred cheaper.. The down side of vaping is once you go to vaping, 'burning' sucks.. tasting ash, butane/sulfur and burning lungs..