Fury 2 is a solid performer. It is the most efficient vaporizer I've used. At the end of a session, all the herb is a varied shade of brown depending upon the temperature. In my opinion, the only way to extract more from the herb would be to burn it. Unfortunately, doing so would expose you to carcinogens, and that feeling in your chest that you have obviously done so. The Fury is smooth as silk and produces hits that could be overwhelming if you are trying to draw a 15 second hit. The first hit is typically soldi but if I had to provide an estimate, I would say that it would be 50% of the next 3 or 4 hits after the 5th draw, the density of the vapor begins to trail off. Depending on the dryness of the herb, I can usually get 4 to 5 solid hits that could be overwhelming if you draw longer than 8-10 seconds. As I sad previously, the remaining hits vary in decreasing intensity. At 396 degrees, only the last long hits begin to get a little warm. At 421 degrees, it is uncomfortable after 7 or 8 hits. I would suggest, beginning at a lower temp, finish the session, allow the Fury II to cool, and restart a new session with the same herb at the higher temps. Overall, I give it a 9 out of 10...an nobody gets a 10 except my wife. ;)