Great device, but never buy it. You can get the same heating element with the same digital control and readout in a heat gun. It will even stand up on its end so that it works exactly the same way. Plus, you can get adapters for the heat gun that attach to bongs so that you can vaporize through a bong. They cost like one- to two-hundred bucks, maybe even less. Then you buy the Volcano kit for about $40 (comes with bags, valve, and mechanism to fill bags from heat gun). Literally the only difference it that it doesn't have the fancy sloping silver walls on the side that give the volcano its name. So for an extra $500, go get a piece of sheet metal and wrap the damn thing if you really want that for some reason.
To see what it looks like, go to google images and type in "digital heat gun".