I just recently bought a Pax, and my first experience was not very positive. The first time I heated it up after charging the battery, I didn't get any vapor at all, but I kept trying until the thing got too hot to hold or put to my lips. The second time, I put more herbs in the oven, and it did seem to work, although the vapor was not nearly as strong as my last vaporizer, which was the NO2 Vapir. I did however, feel the effects of the herbal remedy.
So, I wouldn't mind getting some input from the forum here, but my general thoughts on the Pax is that it is not as great as the guy at the shop described it to be. My main two issues are: 1) It just gets too hot after it's been on for a few minutes. When it worked, the first few hits after the green light were good, but after a few more hits, the mouthpiece gets hot to the point where you can't keep your lips on it long enough to take a decent hit. 2) I may change my thoughts on this, but it doesn't seem very efficient. The size of the oven is pretty large, and that much herb in my Vapir would have been enough for several experiences. That may be the case with the Pax, but I haven't used it enough to make that call yet.
I would appreciate any comments on my experiences, and also if anyone knows of an additional mouth piece for the Pax. All the other models I've seen have some kind of tube, or straw like attachment to keep the mouth farther from the device, and maybe the lack of that in the Pax is a design drawback.