The big negative on this vape is the difficulty of easily seeing the small view window and hence easily combusting. Heating at the tip as originally suggested seems to be the culprit. The jury is out on the carbon fibre sleeve.
Looks like heating it more like a DV instead of all the heat directed towards the end, reduces the chance of combustion considerably. Also being able to instantly view the progress of the roast as the video shows would be a good way to gauge progress, much like a Vaponic.
Plan on picking one of these up eventually, but my vape budget is a little stretched at the moment.