I'll speak up a little on the issue of cracking glass. None of my Gn0mes showed any signs of stress, but that's may be because a very disconnected and distinctly part-time glass blowing hobby over the last few years has led me to appreciate that even heating is very necessary. I've read many of Gn0me's posts elsewhere on the net and have developed a very large (no exaggeration) admiration and respect for Calen. That having been said, I think a recommendation for a gradual, even, rotational, consistent method to heating the heat exchanger should be made.
Many members have talked about (and filmed) a method where they just heat one 1" section, on one side, of the heat exchanger. That's murder on any glass, or any medium really, and is probably leading to a less efficient vaporization as well. In glass blowing, you bring the entire body of glass up to heat as gently and gradually as possible - you start with the piece way out in the tip of the flame while always rotating, and then gradually bring it in closer to the hotter part of the flame, so that an entire section is brought up to heat, so that your goal is to (to beat a dead horse in the hopes of saving your glass) gradually and gently heat the whole section until it is up to temperature.
I don't see why any given well-made Gn0me vape shouldn't last for decades (or perhaps even centuries) as long it is heated gradually, gently and thoughtfully. I'm relatively convinced Calen is a glass ninja/philosopher-king, and I imagine he's checking all his work with a polariscope, and the lion's share of broken Gn0mes are the result of unintentional user abuse.
Sorry about your fallen Gnome TheDude (love Lebowski BTW), and I'd imagine the fall you mentioned onto concrete had everything to do with its death, as tragic as it is. Pretty impressive it didn't just shatter into a thousand pieces when it hit concrete to begin with though, as the Gn0me heat exchanger is pretty damn intricate.
Glass, even borosilicate, is a delicate medium. In all cases, heat it gradually, gently, and consistently on all sides. Whether we're talking about the Gn0me vape, Eclipse vape, vapbong, ubie, vapocane, glass nail or any number of other applicable vapes, heat the glass as I have detailed... Except even more cautiously and gradually.
Let glass that's already hot float in the air or only be in contact with other hot surfaces - contact with cool surfaces causes stress which can lead to instantaneous cracks, something glass blowers sometimes use as a tool.