I purchased a new Pax 2 on Ebay- came in the original package with the shrink wrap and appears 'real' based on the vids and pictures of units online. The icons light up appropriately when charging and using, etc. I've been reading here for some time, and I've read that vaping performance is learned to some extent. But I NEVER get a cloud of visible vapor out of it. When I exhale, there is no visible vapor. The draw is hard; I'm using the standard screen, and maybe that's part of it. When I go to a pipe, the psychotropic effects are much more significant. The herb is sticky, usually a good thing, but that makes it hard for air to pass through it. I use a grinder, and I don't think I good make it any finer. Also frustrating... I don't know when I need to empty and refill the oven. How many 'draws' should I expect after one filling? Am I really supposed to see the billows of vapor as in their ads? Thanks!